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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 31,729 $ 32,114 $ 31,921
Balance 31,867 31,729 32,114
Net unrealized gains/(losses) on cash flow hedge derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (44) (164) (172)
Other comprehensive (loss) gain before reclassifications (29) 155 (312)
Losses (gains) reclassified from accumulated other comprehensive loss 40 (35) 320
Net current-period change in accumulated other comprehensive loss 11 120 8
Balance (33) (44) (164)
Pension and other postretirement liability adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (173) (238) (239)
Other comprehensive (loss) gain before reclassifications 111 65 1
Losses (gains) reclassified from accumulated other comprehensive loss 0 0 0
Net current-period change in accumulated other comprehensive loss 111 65 1
Balance (62) (173) (238)
Total Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (217) (402) (411)
Other comprehensive (loss) gain before reclassifications 82 220 (311)
Losses (gains) reclassified from accumulated other comprehensive loss 40 (35) 320
Net current-period change in accumulated other comprehensive loss 122 185 9
Balance $ (95) $ (217) $ (402)