Commitments (Commitments to Extend Credit and Other Commitments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Commitments	$ 277,172	$ 250,854
Liability related to investments in low income housing tax credits	2,200	2,000
Commitments to extend credit
Other Commitments [Line Items]
Commitments	261,728	237,238
Commitments to extend credit | Total commercial lending
Other Commitments [Line Items]
Commitments	198,542	176,248
Commitments to extend credit | Home equity
Other Commitments [Line Items]
Commitments	22,783	19,410
Commitments to extend credit | Credit card
Other Commitments [Line Items]
Commitments	33,066	32,499
Commitments to extend credit | Other
Other Commitments [Line Items]
Commitments	7,337	9,081
Standby letters of credit
Other Commitments [Line Items]
Commitments	10,575	9,303
Standby letters of credit | Remarketing Programs
Other Commitments [Line Items]
Commitments	3,600	3,300
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,208	1,268
Other commitments
Other Commitments [Line Items]
Commitments	$ 3,661	$ 3,045