xbrli:pure iso4217:USD utr:dth C001031 2026-01-01 2026-06-30 C001031 ScheduleImportantChangesDuringTheQuarterYearAbstract 2026-01-01 2026-06-30 C001031 ScheduleStatementOfAccumulatedOtherComprehensiveIncomeAndHedgingActivitiesAbstract 2026-01-01 2026-06-30 C001031 ScheduleNotesToFinancialStatementsAbstract 2026-01-01 2026-06-30 C001031 2026-06-30 C001031 2025-12-31 C001031 2025-01-01 2025-06-30 C001031 2026-04-01 2026-06-30 C001031 2025-04-01 2025-06-30 C001031 ferc:ElectricUtilityMember 2026-01-01 2026-06-30 C001031 ferc:GasUtilityMember 2026-01-01 2026-06-30 C001031 ferc:GasUtilityMember 2025-01-01 2025-06-30 C001031 ferc:OtherUtilityMember 2026-01-01 2026-06-30 C001031 2024-12-31 C001031 TOTAL Credits to Retained Earnings (Account 439) (footnote details) 2026-01-01 2026-06-30 C001031 TOTAL Debits to Retained Earnings (Account 439) (footnote details) 2026-01-01 2026-06-30 C001031 TOTAL Debits to Retained Earnings (Account 439) (footnote details) 2025-01-01 2025-06-30 C001031 TOTAL Appropriations of Retained Earnings (Account 436) (footnote details) 2026-01-01 2026-06-30 C001031 TOTAL Dividends Declared-Preferred Stock (Account 437) (footnote details) 2026-01-01 2026-06-30 C001031 TOTAL Dividends Declared-Common Stock (Account 438) (footnote details) 2026-01-01 2026-06-30 C001031 2025-06-30 C001031 Other Changes (Explain) 2026-01-01 2026-06-30 C001031 Amortization of (Specify) (footnote details) 2026-01-01 2026-06-30 C001031 Other Adjustments to Cash Flows from Operating Activities 2026-01-01 2026-06-30 C001031 Other Adjustments to Cash Flows from Operating Activities 2025-01-01 2025-06-30 C001031 Other: Change in accounts payable-capital expenditures 2026-01-01 2026-06-30 C001031 Other: Change in accounts payable-capital expenditures 2025-01-01 2025-06-30 C001031 Other Adjustments to Cash Flows from Investment Activities: 2026-01-01 2026-06-30 C001031 Net Increase in Debt (Long Term Advances) 2026-01-01 2026-06-30 C001031 Other Retirements 2026-01-01 2026-06-30 C001031 Cash Distribution to Partner: Discovery Producer Services 2026-01-01 2026-06-30 C001031 ferc:GasUtilityMember 2026-06-30 C001031 Depreciation-Market Expansion 2026-01-01 2026-06-30 C001031 Deferred Taxes on Depreciation Regulatory Assets 2026-01-01 2026-06-30 C001031 Junction 2026-01-01 2026-06-30 C001031 A1000086 - 251030-0705 DSC TETCO Receipt Meter Site Re-Establishment-1 2026-01-01 2026-06-30 C001031 Depreciation-Market Expansion 2026-03-31 C001031 Deferred Taxes on Depreciation Regulatory Assets 2026-03-31 C001031 Junction 2026-03-31 C001031 A1000086 - 251030-0705 DSC TETCO Receipt Meter Site Re-Establishment-1 2026-03-31 C001031 Junction 2026-04-01 2026-06-30 C001031 Depreciation-Market Expansion 2026-04-01 2026-06-30 C001031 Deferred Taxes on Depreciation Regulatory Assets 2026-04-01 2026-06-30 C001031 Depreciation-Market Expansion 2026-06-30 C001031 Deferred Taxes on Depreciation Regulatory Assets 2026-06-30 C001031 Junction 2026-06-30 C001031 A1000086 - 251030-0705 DSC TETCO Receipt Meter Site Re-Establishment-1 2026-06-30 C001031 2026-03-31 C001031 Depreciation Mainline 2026-01-01 2026-06-30 C001031 Depreciation Mainline 2026-03-31 C001031 Depreciation Mainline 2026-04-01 2026-06-30 C001031 Depreciation Mainline 2026-06-30 C001031 Junction FT-2 2026-01-01 2026-06-30 C001031 Market Expansion FT1 2026-01-01 2026-06-30 C001031 Market Expansion FT2 2026-01-01 2026-06-30 C001031 Market Expansion IT 2026-01-01 2026-06-30 C001031 Mainline FT1 2026-01-01 2026-06-30 C001031 Mainline FT2 (Firm) 2026-01-01 2026-06-30 C001031 Mainline FT2 (Negotiated) 2026-01-01 2026-06-30 C001031 Mainline IT 2026-01-01 2026-06-30 C001031 Cashout FT1, FT2 & IT 2026-01-01 2026-06-30 C001031 Junction FT-2 2026-04-01 2026-04-30 C001031 Market Expansion IT 2026-04-01 2026-04-30 C001031 Mainline FT1 2026-04-01 2026-04-30 C001031 Mainline FT2 (Firm) 2026-04-01 2026-04-30 C001031 Mainline FT2 (Negotiated) 2026-04-01 2026-04-30 C001031 Mainline IT 2026-04-01 2026-04-30 C001031 Cashout FT1, FT2 & IT 2026-04-01 2026-04-30 C001031 Junction FT-2 2026-05-01 2026-05-31 C001031 Market Expansion IT 2026-05-01 2026-05-31 C001031 Mainline FT1 2026-05-01 2026-05-31 C001031 Mainline FT2 (Firm) 2026-05-01 2026-05-31 C001031 Mainline FT2 (Negotiated) 2026-05-01 2026-05-31 C001031 Mainline IT 2026-05-01 2026-05-31 C001031 Junction FT-2 2026-06-01 2026-06-30 C001031 Market Expansion FT2 2026-06-01 2026-06-30 C001031 Market Expansion IT 2026-06-01 2026-06-30 C001031 Mainline FT1 2026-06-01 2026-06-30 C001031 Mainline FT2 (Firm) 2026-06-01 2026-06-30 C001031 Mainline FT2 (Negotiated) 2026-06-01 2026-06-30 C001031 Mainline IT 2026-06-01 2026-06-30 C001031 2026-04-01 2026-04-30 C001031 2026-05-01 2026-05-31 C001031 2026-06-01 2026-06-30 C001031 0 2026-01-01 2026-06-30 C001031 0 Other Receipts 2026-01-01 2026-06-30 C001031 0 2026-04-01 2026-06-30 C001031 ferc:DiscountedRateMember 2026-04-01 2026-04-30 C001031 ferc:NegotiatedRateMember 2026-04-01 2026-04-30 C001031 Linepack + systen balancing gas 2026-04-01 2026-04-30 C001031 ferc:DiscountedRateMember 2026-05-01 2026-05-31 C001031 ferc:NegotiatedRateMember 2026-05-01 2026-05-31 C001031 Linepack + system balancing gas 2026-05-01 2026-05-31 C001031 ferc:DiscountedRateMember 2026-06-01 2026-06-30 C001031 ferc:NegotiatedRateMember 2026-06-01 2026-06-30 C001031 Linepack + system balancing gas 2026-06-01 2026-06-30 C001031 ferc:GasUtilityMember ferc:ProductionAndGatheringPlantMember 2026-01-01 2026-06-30 C001031 ferc:GasUtilityMember ferc:TransmissionPlantMember 2026-01-01 2026-06-30 <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">4. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">5. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">6. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">7. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">8. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">11. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">12. None</span></div> <div style="margin-top:2pt;padding-right:18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">13. None</span></div> C001031 2/3-Q Discovery Gas Transmission LLC 2026 Q2 One Williams Center, WRC2.A, Tulsa Ok 74172 Joleen Patterson Accounting Supervisor One Williams Center, WRC2.A, Tulsa Ok 74172 539-777-1567 O 2026-08-30 Mark Cizek Vice President Mark Cizek 2026-08-30 N/A N/A N/A 397922401 397705256 15372.00 397937773 397705256 235747549 231625164 162190224 166080092 162190224 166080092 12021709 9717032 7823867 5313633 1539346.00 144784 49167 249634 21578873 15280299 48713983 47322623 2713832 2543802 14283238 14544000 65711053 64410425 249480150 245770816 160330136 160330141 -13046895 -14072916 147283241 146257225 35071228 39052460 35071228 39052460 779221 1773089 3815488 2978219 2765300 2829313 944760 2854 7577806 1518963 15882575 9102438 278692 278692 1534418 1650001 48693000 48693000 737000 737000 51243110 51358693 249480154 245770816 16178679 14862997 8784351 6884130 0 16178679 14862997 0 9803511 8680188 5666265 3668457 0 9803511 8680188 0 427205 500367 75351 123754 0 427205 500367 0 3958617 4178215 1979354 2086539 0 3958617 4178215 0 197564 197382 98873 98691 0 197564 197382 0 0 0 0 0 0 0 0 0 45370 45370 22685 22685 0 45370 45370 0 1546890 1862646 774798 966342 0 1546890 1862646 0 1080314 1062477 536150 466008 0 1080314 1062477 0 0 0 489 2432 240 1216 0 489 2432 0 939000 2688500 469500 1344250 0 939000 2688500 0 678500 1503000 438724 751500 0 678500 1503000 0 0 0 0 0 0 0 0 0 0 0 1120209 1058553 564068 525531 0 1120209 1058553 0 15346889 15047838 8198964 6619289 15346889 15047838 831790 -184841 585387 264841 831790 -184841 -1 -2554 -9 -1907 218401 187793 111239 82734 218400 185239 111230 80827 18269 7123 6955 5361 5905 5470 3293 2440 24174 12593 10248 7801 194226 172646 100982 73026 1026016 -12195 686369 337867 1026016 -12195 686369 337867 -14072911 -14942261 TOTAL Credits to Retained Earnings (Account 439) (footnote details) TOTAL Debits to Retained Earnings (Account 439) (footnote details) 4 5 1026016 869350 TOTAL Appropriations of Retained Earnings (Account 436) (footnote details) TOTAL Dividends Declared-Preferred Stock (Account 437) (footnote details) TOTAL Dividends Declared-Common Stock (Account 438) (footnote details) -13046895 -14072911 -14072911 Other Changes (Explain) 174946 5434152 Amortization of (Specify) (footnote details) 260762 1187931 4049580 -819057 7427383 -631624 1617103 1917119 -115583 -91392 Other Adjustments to Cash Flows from Operating Activities 100784 897458 3207625 5686268 110917 338248 Other: Change in accounts payable-capital expenditures 792030 -168161 902946 170087 2304677 5516181 Other Adjustments to Cash Flows from Investment Activities: -3207623 -5686268 Net Increase in Debt (Long Term Advances) Other Retirements Cash Distribution to Partner: Discovery Producer Services 1 1 397922401 397922401 397922401 397922401 15372 15372 397937773 235747549 162190224 235747549 235747549 235747549 235747549 Depreciation-Market Expansion Deferred Taxes on Depreciation Regulatory Assets 1 2 Junction 3 A1000086 - 251030-0705 DSC TETCO Receipt Meter Site Re-Establishment-1 4 33153 579347 47344451 60000 719718 1229 21457 31924 557890 48064169 60000 48016951 719718 22686 Depreciation Mainline 1592209 -57791 1534418.00 1592209 -57791 Junction FT-2 Market Expansion FT1 4 5 Market Expansion FT2 6 Market Expansion IT 7 Mainline FT1 9 Mainline FT2 (Firm) 10 Mainline FT2 (Negotiated) 11 Mainline IT 12 Cashout FT1, FT2 & IT 13 5348172 605891 420318 12583543 328165 1042989 630 19018 492 1563 642630 17681 60439 1301853 62351 99159 1401181 642630 17681 61069 1320871 62843 100722 1401181 5739860 1522603 371226 12693028 323750 1984942 630 19275 486 2978 699210 61859 60175 1328864 61514 169760 699210 61859 60805 1348139 62000 172738 4442484 67000 1224161 293754 10335077 248868 1392203 441 16008 375 2088 504454 5345 69860 110911 1075117 47286 134372 504454 5345 69860 111352 1091125 47661 136460 20329078 21703 3585294 3606997 22635409 23369 2381382 2404751 18003547 18912 1947345 1966257 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4148269 146822 146822 3951592 133954 133954 3402585 114640 114640 7970 239 239 10197 304 304 5869 176 176 4156239 147061 147061 3961789 134258 134258 3408454 114816 114816 947519 134452 134452 975694 137136 137136 992478 138619 138619 947519 134452 134452 975694 137136 137136 992478 138619 138619 25432836 21703 3866807 3888510 27572892 23369 2652776 2676145 22404479 18912 2200780 2219692 23662387 91366427 Other Receipts 115028814 23662387 91574673 205875 -201690 -201879 -6556 -3996 115028814 115028814 0 88 16 104 88 16 104 -4102 -78 -4180 -4102 -78 -4180 Linepack + systen balancing gas -4190 -94 -4284 -4190 -94 -4284 61016075 61016075 579 101 680 579 101 680 54792 53878 914 54792 53878 914 109584 53299 813 54112 Linepack + system balancing gas 53299 813 54112 1715 61 1776 1715 61 1776 149046 2221 151267 149046 2221 151267 147331 2160 149491 Linepack + system balancing gas 147331 2160 149491 53115371 27559885 344807030 208187664 397922401 235747549 835445 23662387 14511378 211537419 831856 16178679 162992 0 162992 574348 -333400 240948 403940 204521 87779 292294 7873 3136427 7261 3065706 6801861 209 117243 92032 23784 2 193935 427205 7229066 7229066 816612 289120 4514 415507 278283 150942 439174 0 133455 0 5354 47129 26648 2597710 2597710 293639 99415 393054 3664978 98149 3763127 3958617 197564 4156181 The Workiva Platform