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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 34,086 $ 34,531
Balance 32,124 34,484
Net unrealized gains/(losses) on cash flow hedge derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (7) 164
Other comprehensive (loss) gain before reclassifications 40 (152)
Loss (gain) reclassified from accumulated other comprehensive loss 77 (5)
Net current-period change in accumulated other comprehensive (loss) income 117 (157)
Balance 110 7
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 0 (91)
Other comprehensive (loss) gain before reclassifications 1 24
Loss (gain) reclassified from accumulated other comprehensive loss 0 0
Net current-period change in accumulated other comprehensive (loss) income 1 24
Balance 1 (67)
Pension and other postretirement liability adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (326) (403)
Other comprehensive (loss) gain before reclassifications 16 15
Loss (gain) reclassified from accumulated other comprehensive loss 0 0
Net current-period change in accumulated other comprehensive (loss) income 16 15
Balance (310) (388)
Total accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (333) (330)
Other comprehensive (loss) gain before reclassifications 57 (113)
Loss (gain) reclassified from accumulated other comprehensive loss 77 (5)
Net current-period change in accumulated other comprehensive (loss) income 134 (118)
Balance $ (199) $ (448)