Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 34,595	$ 2,293
Total other comprehensive loss	(643)	(18)
Balance at end of period	33,287	2,394
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(141)	(16)
Other comprehensive loss before reclassifications	(8)	(23)
Amounts reclassified from accumulated other comprehensive loss	3	1
Total other comprehensive loss	(5)	(22)
Balance at end of period	(146)	(38)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(33)	(49)
Other comprehensive loss before reclassifications	(626)	4
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive loss	(626)	4
Balance at end of period	(659)	(45)
Pension Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(6)	(2)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive loss	0	0
Balance at end of period	(6)	(2)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(180)	(67)
Other comprehensive loss before reclassifications	(634)	(19)
Amounts reclassified from accumulated other comprehensive loss	3	1
Total other comprehensive loss	(631)	(18)
Balance at end of period	$ (811)	$ (85)