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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Abstract]        
Accumulated Other Comprehensive Income (Loss), Beginning Balance     $ 307 $ 365
Other comprehensive income (loss) for period, before reclassifications     (81) (48)
Reclassification of losses (gains) to net income during period     (50) (49)
Total other comprehensive income (loss) for period $ 33 $ 27 (131) (97)
Accumulated Other Comprehensive Income (Loss), Ending balance 176 268 176 268
Interest expense 332 302 663 616
Revenue (13,483) (10,651) (28,243) (23,095)
Operating costs and expenses 11,762 9,137 24,736 19,894
Total (1,422) (1,283) (2,905) (2,705)
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 (5)
Reclassification of losses (gains) to net income during period     (3) (1)
Total other comprehensive income (loss) for period     (1) (6)
Accumulated Other Comprehensive Income (Loss), Ending balance 150 186 150 186
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     (83) (43)
Reclassification of losses (gains) to net income during period     (47) (48)
Total other comprehensive income (loss) for period     (130) (91)
Accumulated Other Comprehensive Income (Loss), Ending balance 24 80 24 80
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 (46) (19) (50) (49)
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 (1) (3) (3) (1)
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 (61) (27) (80) (51)
Operating costs and expenses $ 16 $ 11 $ 33 $ 3