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Capital Accounts, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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     125 (144)
Reclassification of losses (gains) to net income during period     (129) (18)
Total other comprehensive income (loss) for period $ 127 $ (65) (4) (162)
Accumulated Other Comprehensive Income (Loss), Ending balance 303 203 303 203
Interest expense 343 328 1,006 944
Revenue (13,775) (11,998) (42,018) (35,093)
Operating costs and expenses 12,033 10,366 36,769 30,260
Total (1,432) (1,350) (4,337) (4,055)
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     (5) (3)
Total other comprehensive income (loss) for period     (7) (8)
Accumulated Other Comprehensive Income (Loss), Ending balance 144 184 144 184
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     127 (139)
Reclassification of losses (gains) to net income during period     (124) (15)
Total other comprehensive income (loss) for period     3 (154)
Accumulated Other Comprehensive Income (Loss), Ending balance 157 17 157 17
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 (79) 31 (129) (18)
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) (2) (5) (3)
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 (96) 58 (176) 7
Operating costs and expenses $ 19 $ (25) $ 52 $ (22)