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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ 365 | $ 286 |
Other comprehensive income (loss) for period, before reclassifications | 57 | 280 |
Reclassification of losses (gains) to net income during period | (115) | (201) |
Total other comprehensive income (loss) for period | (58) | 79 | $ 451
Accumulated Other Comprehensive Income (Loss), Ending balance | 307 | 365 | 286
Interest expense | 1,269 | 1,244 | 1,283
Revenue | (49,715) | (58,186) | (40,807)
Operating costs and expenses | 43,017 | 51,502 | 35,078
Total | (5,657) | (5,615) | (4,755)
Cash Flow Hedges [Member] | Commodity Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 171 | 137 |
Other comprehensive income (loss) for period, before reclassifications | 93 | 254 |
Reclassification of losses (gains) to net income during period | (110) | (220) |
Total other comprehensive income (loss) for period | (17) | 34 |
Accumulated Other Comprehensive Income (Loss), Ending balance | 154 | 171 | 137
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Abstract] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 192 | 147 |
Other comprehensive income (loss) for period, before reclassifications | (36) | 26 |
Reclassification of losses (gains) to net income during period | (5) | 19 |
Total other comprehensive income (loss) for period | (41) | 45 |
Accumulated Other Comprehensive Income (Loss), Ending balance | 151 | 192 | 147
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 | (115) | (201) |
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 | (106) | (181) |
Operating costs and expenses | (4) | (39) |
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 | $ (5) | $ 19 |

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