Commitments (Other Commitments) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Other Commitments [Line Items]
Commitments	$ 308,489	$ 295,100
Investments in qualified affordable housing projects	2,700	2,200
Commitments to extend credit
Other Commitments [Line Items]
Commitments	290,230	277,785
Commitments to extend credit \| Commercial
Other Commitments [Line Items]
Commitments	220,701	209,864
Commitments to extend credit \| Home equity
Other Commitments [Line Items]
Commitments	23,962	24,086
Commitments to extend credit \| Credit card
Other Commitments [Line Items]
Commitments	37,964	36,447
Commitments to extend credit \| Other
Other Commitments [Line Items]
Commitments	7,603	7,388
Standby letters of credit
Other Commitments [Line Items]
Commitments	11,296	11,251
Standby letters of credit \| Remarketing Programs
Other Commitments [Line Items]
Commitments	3,700	3,700
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,084	1,095
Other commitments
Other Commitments [Line Items]
Commitments	$ 5,879	$ 4,969