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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 32,114 $ 31,921 $ 31,838
Balance 31,729 32,114 31,921
Net unrealized gains/(losses) on cash flow hedge derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (164) (172) (13)
Other comprehensive (loss) gain before reclassifications 155 (312) (432)
Losses (gains) reclassified from accumulated other comprehensive loss (35) 320 273
Net current-period change in accumulated other comprehensive loss 120 8 (159)
Balance (44) (164) (172)
Pension and other postretirement liability adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (238) (239) (394)
Other comprehensive (loss) gain before reclassifications 65 1 155
Losses (gains) reclassified from accumulated other comprehensive loss 0 0 0
Net current-period change in accumulated other comprehensive loss 65 1 155
Balance (173) (238) (239)
Total Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (402) (411) (407)
Other comprehensive (loss) gain before reclassifications 220 (311) (277)
Losses (gains) reclassified from accumulated other comprehensive loss (35) 320 273
Net current-period change in accumulated other comprehensive loss 185 9 (4)
Balance $ (217) $ (402) $ (411)