Equity - Summary of Changes in the Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 3,852	$ 3,960	$ 4,259	$ 3,618
Foreign currency translation adjustment	239	(173)	(170)	185
Net change in fair value of derivatives, net of tax			(229)
Amounts reclassified to earnings of cash flow hedges, net of tax	22	5	51	7
Ending balances	3,915	4,063	3,915	4,063
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			306
Net change in fair value of derivatives, net of tax			(229)
Amounts reclassified to earnings of cash flow hedges, net of tax			51
Ending balances	128		128
Pensions
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(29)
Ending balances	(29)		(29)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(1,455)
Foreign currency translation adjustment			(170)
Ending balances	(1,625)		(1,625)
Accumulated  Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(1,572)	(1,284)	(1,178)	(1,437)
Ending balances	$ (1,526)	$ (1,334)	$ (1,526)	$ (1,334)