Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Before Tax
Net unrealized gains (losses) on securities available for sale	$ 1,267	$ (4,287)
Net unrealized gains (losses) on hedging relationships	528	(1,593)
Foreign currency translation adjustments	1	10
Other comprehensive income (loss), before tax	1,796	(5,870)
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	305	(1,034)
Net unrealized gains (losses) on hedging relationships	127	(384)
Foreign currency translation adjustments	(12)	15
Other comprehensive income (loss), provision (benefit)	420	(1,403)
After Tax
Net unrealized gains (losses) on securities available for sale	962	(3,253)
Net unrealized gains (losses) on hedging relationships	401	(1,209)
Foreign currency translation adjustments	13	(5)
Other comprehensive income (loss), net of tax	$ 1,376	$ (4,467)