Derivative Instruments - Change in Unrealized Gains (Losses) in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 1,331	$ 268	$ 571	$ 536
Change in fair value, net of tax			(109)
Reclassification into earnings, net of tax			(4)
Ending Balance	1,915	498	1,915	498
Cash Flow Hedges | Foreign exchange forward contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	12	(1)	14	2
Change in fair value, net of tax	0	13	8	6
Reclassification into earnings, net of tax	(5)	(2)	(15)	2
Ending Balance	7	10	7	10
Cash Flow Hedges | Interest rate swap contracts
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(155)	0	0	0
Change in fair value, net of tax	27	0	(128)	0
Reclassification into earnings, net of tax	0	0	0	0
Ending Balance	(128)	0	(128)	0
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(59)	0	(81)	(8)
Change in fair value, net of tax	22	(36)	40	(28)
Reclassification into earnings, net of tax	1	0	5	0
Ending Balance	$ (36)	$ (36)	$ (36)	$ (36)