Commitments (Other Commitments) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Other Commitments [Line Items]
Commitments	$ 268,298	$ 250,854
Liability Related To Investments In Low Income Housing Tax Credits	2,000	2,000
Commitments to extend credit
Other Commitments [Line Items]
Commitments	253,461	237,238
Commitments to extend credit | Commercial
Other Commitments [Line Items]
Commitments	190,761	176,248
Commitments to extend credit | Home equity
Other Commitments [Line Items]
Commitments	21,674	19,410
Commitments to extend credit | Credit card
Other Commitments [Line Items]
Commitments	33,142	32,499
Commitments to extend credit | Other
Other Commitments [Line Items]
Commitments	7,884	9,081
Standby letters of credit
Other Commitments [Line Items]
Commitments	9,987	9,303
Standby letters of credit | Remarketing Programs
Other Commitments [Line Items]
Commitments	3,800	3,300
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,317	1,268
Other commitments
Other Commitments [Line Items]
Commitments	$ 3,533	$ 3,045