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Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Before Tax
Net unrealized gains (losses) on securities available for sale	$ 337	$ (244)	$ 1,753	$ (1,359)
Net unrealized gains (losses) on hedging relationships	518	24	1,404	(518)
Foreign currency translation adjustments	(10)	3	(15)	6
Other	0	0	0	1
Other comprehensive income (loss)	845	(217)	3,142	(1,870)
Provision (Benefit)
Net unrealized gains (losses) on securities available for sale	83	(60)	428	(331)
Net unrealized gains (losses) on hedging relationships	126	6	342	(126)
Foreign currency translation adjustments	(74)	4	(95)	20
Other	0	0	0	0
Other comprehensive income (loss)	135	(50)	675	(437)
After Tax
Net unrealized gains (losses) on securities available for sale	254	(184)	1,325	(1,028)
Net unrealized gains (losses) on hedging relationships	392	18	1,062	(392)
Foreign currency translation adjustments	64	(1)	80	(14)
Other	0	0	0	1
Other comprehensive income (loss), net of tax	$ 710	$ (167)	$ 2,467	$ (1,433)

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