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Capital Accounts - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 29,589 | $ 28,759 | $ 27,702
Total other comprehensive income (loss) | 100 | (71) | (58)
Ending balance | 30,570 | 29,589 | 28,759
Interest expense | 1,401 | 1,352 | 1,269
Revenue | (52,596) | (56,219) | (49,715)
Operating costs and expenses | 45,440 | 49,045 | 43,017
Total | (5,876) | (5,970) | (5,657)
Cash Flow Hedges | Commodity Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 91 | 154 |
Other comprehensive income (loss) for period, before reclassifications | 285 | 115 |
Reclassification of losses (gains) to net income during period | (192) | (178) |
Total other comprehensive income (loss) | 93 | (63) |
Ending balance | 184 | 91 | 154
Cash Flow Hedges | Interest Rate Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 143 | 151 |
Other comprehensive income (loss) for period, before reclassifications | 14 | (2) |
Reclassification of losses (gains) to net income during period | (7) | (6) |
Total other comprehensive income (loss) | 7 | (8) |
Ending balance | 150 | 143 | 151
Other |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 2 | 2 |
Other comprehensive income (loss) for period, before reclassifications | 0 | 0 |
Reclassification of losses (gains) to net income during period | 0 | 0 |
Total other comprehensive income (loss) | 0 | 0 |
Ending balance | 2 | 2 | 2
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 236 | 307 |
Other comprehensive income (loss) for period, before reclassifications | 299 | 113 |
Reclassification of losses (gains) to net income during period | (199) | (184) |
Total other comprehensive income (loss) | 100 | (71) |
Ending balance | 336 | 236 | $ 307
Losses (gains) on cash flow hedges: | Cash Flow Hedges |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Total | (199) | (184) |
Losses (gains) on cash flow hedges: | Cash Flow Hedges | Commodity Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Revenue | (235) | (249) |
Operating costs and expenses | 43 | 71 |
Losses (gains) on cash flow hedges: | Cash Flow Hedges | Interest Rate Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Interest expense | $ (7) | $ (6) |

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