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Capital Accounts - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 29,589 $ 28,759 $ 27,702
Total other comprehensive income (loss) 100 (71) (58)
Ending balance 30,570 29,589 28,759
Interest expense 1,401 1,352 1,269
Revenue (52,596) (56,219) (49,715)
Operating costs and expenses 45,440 49,045 43,017
Total (5,876) (5,970) (5,657)
Cash Flow Hedges | Commodity Derivative Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 91 154  
Other comprehensive income (loss) for period, before reclassifications 285 115  
Reclassification of losses (gains) to net income during period (192) (178)  
Total other comprehensive income (loss) 93 (63)  
Ending balance 184 91 154
Cash Flow Hedges | Interest Rate Derivative Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 143 151  
Other comprehensive income (loss) for period, before reclassifications 14 (2)  
Reclassification of losses (gains) to net income during period (7) (6)  
Total other comprehensive income (loss) 7 (8)  
Ending balance 150 143 151
Other      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
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) 0 0  
Ending balance 2 2 2
Accumulated Other Comprehensive Income (Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 236 307  
Other comprehensive income (loss) for period, before reclassifications 299 113  
Reclassification of losses (gains) to net income during period (199) (184)  
Total other comprehensive income (loss) 100 (71)  
Ending balance 336 236 $ 307
Losses (gains) on cash flow hedges: | Cash Flow Hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Total (199) (184)  
Losses (gains) on cash flow hedges: | Cash Flow Hedges | Commodity Derivative Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Revenue (235) (249)  
Operating costs and expenses 43 71  
Losses (gains) on cash flow hedges: | Cash Flow Hedges | Interest Rate Derivative Instruments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Interest expense $ (7) $ (6)