Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Before Tax
Net unrealized gains (losses) on securities available for sale	$ 1,183	$ (10,516)	$ (2,486)
Net unrealized gains (losses) on hedging relationships	906	(3,032)	(1,640)
Foreign currency translation adjustments	6	98	17
Other	8	(24)	4
Other comprehensive income (loss)	2,103	(13,474)	(4,105)
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	276	(2,543)	(597)
Net unrealized gains (losses) on hedging relationships	217	(732)	(396)
Foreign currency translation adjustments	(40)	97	7
Other	2	(6)	1
Other comprehensive income (loss)	455	(3,184)	(985)
After Tax
Net unrealized gains (losses) on securities available for sale	907	(7,973)	(1,889)
Net unrealized gains (losses) on hedging relationships	689	(2,300)	(1,244)
Foreign currency translation adjustments	46	1	10
Other	6	(18)	3
Other comprehensive income (loss), net of tax	$ 1,648	$ (10,290)	$ (3,120)