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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Loss [Line Items]    
Balance $ 31,729 $ 32,114
Balance 31,694 31,909
Net unrealized gains/(losses) on cash flow hedge derivatives    
Accumulated Other Comprehensive Loss [Line Items]    
Balance (44) (164)
Other comprehensive (loss) gain before reclassifications (81) 155
Loss (gain) reclassified from accumulated other comprehensive loss 22 (51)
Net current-period change in accumulated other comprehensive loss (59) 104
Balance (103) (60)
Pension and other postretirement liability adjustments    
Accumulated Other Comprehensive Loss [Line Items]    
Balance (173) (238)
Other comprehensive (loss) gain before reclassifications 14 8
Loss (gain) reclassified from accumulated other comprehensive loss 0 0
Net current-period change in accumulated other comprehensive loss 14 8
Balance (159) (230)
Total accumulated other comprehensive loss    
Accumulated Other Comprehensive Loss [Line Items]    
Balance (217) (402)
Other comprehensive (loss) gain before reclassifications (67) 163
Loss (gain) reclassified from accumulated other comprehensive loss 22 (51)
Net current-period change in accumulated other comprehensive loss (45) 112
Balance $ (262) $ (290)