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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Accumulated Other Comprehensive Income (Loss), Beginning Balance     $ 365 $ 286
Other comprehensive income (loss) for period, before reclassifications     (144) 126
Reclassification of losses (gains) to net income during period     (18) (39)
Total other comprehensive income (loss) for period $ (65) $ 196 (162) 87
Accumulated Other Comprehensive Income (Loss), Ending balance 203 373 203 373
Interest expense 328 309 944 937
Revenue (11,998) (15,468) (35,093) (44,536)
Operating costs and expenses 10,366 13,812 30,260 39,550
Total (1,350) (1,392) (4,055) (4,163)
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     (5) 0
Reclassification of losses (gains) to net income during period     (3) 15
Total other comprehensive income (loss) for period     (8) 15
Accumulated Other Comprehensive Income (Loss), Ending balance 184 162 184 162
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     (139) 126
Reclassification of losses (gains) to net income during period     (15) (54)
Total other comprehensive income (loss) for period     (154) 72
Accumulated Other Comprehensive Income (Loss), Ending balance 17 209 17 209
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 2
Reclassification of Losses (Gains) out of Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Total 31 10 (18) (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 (2) 1 (3) 15
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 58 35 7 (12)
Operating costs and expenses $ (25) $ (26) $ (22) $ (42)