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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance $ 286 $ (165)
Other comprehensive income (loss) for period, before reclassifications (99) (278)
Reclassification of losses (gains) to net income during period 53 624
Total other comprehensive income (loss) for period (46) 346
Accumulated Other Comprehensive Income (Loss), Ending balance 240 181
Interest expense 319 323
Revenue (13,008) (9,155)
Operating costs and expenses 11,397 7,553
Total (1,331) (1,363)
Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance 147 (74)
Other comprehensive income (loss) for period, before reclassifications 0 183
Reclassification of losses (gains) to net income during period 8 8
Total other comprehensive income (loss) for period 8 191
Accumulated Other Comprehensive Income (Loss), Ending balance 155 117
Cash Flow Hedges [Member] | Commodity Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Accumulated Other Comprehensive Income (Loss), Beginning Balance 137 (93)
Other comprehensive income (loss) for period, before reclassifications (99) (461)
Reclassification of losses (gains) to net income during period 45 616
Total other comprehensive income (loss) for period (54) 155
Accumulated Other Comprehensive Income (Loss), Ending balance 83 62
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
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Total 53 624
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Interest Rate Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Interest expense 8 8
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Cash Flow Hedges [Member] | Commodity Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Revenue 39 597
Operating costs and expenses $ 6 $ 19