Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 5,917	$ 5,917	$ 5,418	$ 5,497
Increase / (Decrease)		(9)	47
Reclassifications		2	(2)
Ending balance		6,488	5,917	5,418
Loss on settlement of treasury rate locks, pre-tax	175
Loss on settlement of treasury rate locks, after-tax	136
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(638)	(638)	(661)
Increase / (Decrease)		286	23
Reclassifications		0	0
Ending balance		(352)	(638)	(661)
Translation Adjustments on Net Investment Hedge
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(38)	(38)	(66)
Increase / (Decrease)		(137)	28
Reclassifications		0	0
Ending balance		(175)	(38)	(66)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	11	11	0
Increase / (Decrease)		(147)	11
Reclassifications		3	0
Ending balance		(133)	11	0
Defined Benefit Pension and Other Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(9)	(9)	10
Increase / (Decrease)		(10)	(17)
Reclassifications		(1)	(2)
Ending balance		(20)	(9)	10
Investment Securities Available-for-Sale
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1	1	(1)
Increase / (Decrease)		(1)	2
Reclassifications		0	0
Ending balance		0	1	(1)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ (673)	(673)	(718)
Ending balance		$ (680)	$ (673)	$ (718)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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