Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Before Tax
Net unrealized gains (losses) on securities available for sale	$ (10,516)	$ (2,486)	$ 1,659
Net unrealized gains (losses) on hedging relationships	(3,032)	(1,640)	1,329
Foreign currency translation adjustments	98	17	56
Other	(24)	4	4
Other comprehensive income (loss), before tax	(13,474)	(4,105)	3,048
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	(2,543)	(597)	400
Net unrealized gains (losses) on hedging relationships	(732)	(396)	321
Foreign currency translation adjustments	97	7	(20)
Other	(6)	1	1
Other comprehensive income (loss), provision (benefit)	(3,184)	(985)	702
After Tax
Net unrealized gains (losses) on securities available for sale	(7,973)	(1,889)	1,259
Net unrealized gains (losses) on hedging relationships	(2,300)	(1,244)	1,008
Foreign currency translation adjustments	1	10	76
Other	(18)	3	3
Other comprehensive income (loss), net of tax	$ (10,290)	$ (3,120)	$ 2,346