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Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Before Tax
Net unrealized gains (losses) on securities available for sale	$ (270)	$ 1	$ (1,716)	$ 1,903
Net unrealized gains (losses) on hedging relationships	(255)	(231)	(1,089)	1,653
Foreign currency translation adjustments	(6)	4	11	3
Other	(3)	(2)	(4)	(2)
Other comprehensive income (loss), before tax	(534)	(228)	(2,798)	3,557
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	(62)	0	(411)	456
Net unrealized gains (losses) on hedging relationships	(60)	(56)	(262)	397
Foreign currency translation adjustments	21	(24)	10	19
Other	(1)	0	(1)	0
Other comprehensive income (loss), provision (benefit)	(102)	(80)	(664)	872
After Tax
Net unrealized gains (losses) on securities available for sale	(208)	1	(1,305)	1,447
Net unrealized gains (losses) on hedging relationships	(195)	(175)	(827)	1,256
Foreign currency translation adjustments	(27)	28	1	(16)
Other	(2)	(2)	(3)	(2)
Other comprehensive income (loss), net of tax	$ (432)	$ (148)	$ (2,134)	$ 2,685

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