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Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Before Tax
Net unrealized gains on securities available for sale	$ 1,022	$ 3,033	$ 2,775	$ 1,674
Net unrealized gains on hedging relationships	199	1,412	1,603	894
Foreign currency translation adjustments	17	2	2	8
Other	0	0	0	1
Other comprehensive income	1,238	4,447	4,380	2,577
Provision (Benefit)
Net unrealized gains on securities available for sale	253	733	681	402
Net unrealized gains on hedging relationships	50	343	392	217
Foreign currency translation adjustments	33	(43)	(62)	(23)
Other	0	0	0	0
Other comprehensive income	336	1,033	1,011	596
After Tax
Net unrealized gains on securities available for sale	769	2,300	2,094	1,272
Net unrealized gains on hedging relationships	149	1,069	1,211	677
Foreign currency translation adjustments	(16)	45	64	31
Other	0	0	0	1
Other comprehensive income, net of tax	$ 902	$ 3,414	$ 3,369	$ 1,981

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