Variable Interest Entities - Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Variable Interest Entity [Line Items]
Income recorded on investments within other fee revenue	$ 107	$ 99
Income recorded in total revenue	3,796	3,284
VIE - not primary beneficiary
Variable Interest Entity [Line Items]
Income recorded on investments within other fee revenue	4	3
Income recorded in total revenue	4	3
Tax credits and benefits recognized in income tax expense	46	55
Proportional amortization recognized in income tax expense	(36)	(43)
Net benefits included in income tax expense	10	12
Net benefit attributable to tax-advantaged investments included in the consolidated statement of income for which proportional amortization has been elected	$ 14	$ 15