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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 34,086	$ 34,531	$ 35,124
Balance	31,838	34,086	34,531
Net unrealized gains/(losses) on cash flow hedge derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(7)	164	(27)
Other comprehensive (loss) gain before reclassifications	249	(177)	111
Losses (gains) reclassified from accumulated other comprehensive loss	(255)	6	84
Impact of adoption of ASU 2018-02 (see below)			(4)
Net current-period change in accumulated other comprehensive (loss) income	(6)	(171)	191
Balance	(13)	(7)	164
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	0	(91)	(189)
Other comprehensive (loss) gain before reclassifications	0	0	(89)
Losses (gains) reclassified from accumulated other comprehensive loss	0	91	223
Impact of adoption of ASU 2018-02 (see below)			(36)
Net current-period change in accumulated other comprehensive (loss) income	0	91	98
Balance	0	0	(91)
Pension and other postretirement liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(326)	(403)	(325)
Other comprehensive (loss) gain before reclassifications	(68)	77	(31)
Losses (gains) reclassified from accumulated other comprehensive loss	0	0	22
Impact of adoption of ASU 2018-02 (see below)			(69)
Net current-period change in accumulated other comprehensive (loss) income	(68)	77	(78)
Balance	(394)	(326)	(403)
Total Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(333)	(330)	(541)
Other comprehensive (loss) gain before reclassifications	181	(100)	(9)
Losses (gains) reclassified from accumulated other comprehensive loss	(255)	97	329
Impact of adoption of ASU 2018-02 (see below)			(109)
Net current-period change in accumulated other comprehensive (loss) income	(74)	(3)	211
Balance	$ (407)	$ (333)	$ (330)

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