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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ 307 | $ 365 |
Other comprehensive income (loss) for period, before reclassifications | 113 | 57 |
Reclassification of losses (gains) to net income during period | (184) | (115) |
Total other comprehensive income (loss) for period | (71) | (58) | $ 79
Accumulated Other Comprehensive Income (Loss), Ending balance | 236 | 307 | 365
Interest expense | 1,352 | 1,269 | 1,244
Revenue | (56,219) | (49,715) | (58,186)
Operating costs and expenses | 49,045 | 43,017 | 51,502
Total | (5,970) | (5,657) | (5,615)
Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 154 | 171 |
Other comprehensive income (loss) for period, before reclassifications | 115 | 93 |
Reclassification of losses (gains) to net income during period | (178) | (110) |
Total other comprehensive income (loss) for period | (63) | (17) |
Accumulated Other Comprehensive Income (Loss), Ending balance | 91 | 154 | 171
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 151 | 192 |
Other comprehensive income (loss) for period, before reclassifications | (2) | (36) |
Reclassification of losses (gains) to net income during period | (6) | (5) |
Total other comprehensive income (loss) for period | (8) | (41) |
Accumulated Other Comprehensive Income (Loss), Ending balance | 143 | 151 | 192
Other [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), 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) for period | 0 | 0 |
Accumulated Other Comprehensive Income (Loss), Ending balance | 2 | 2 | $ 2
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Total | (184) | (115) |
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Revenue | (249) | (106) |
Operating costs and expenses | 71 | (4) |
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Interest expense | $ (6) | $ (5) |

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