Commitments (Other Commitments) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other Commitments [Line Items]
Commitments	$ 276,568	$ 277,172
Liability Related To Investments In Low Income Housing Tax Credits	2,100	2,200
Commitments to extend credit
Other Commitments [Line Items]
Commitments	261,905	261,728
Commitments to extend credit | Commercial
Other Commitments [Line Items]
Commitments	196,185	198,542
Commitments to extend credit | Home equity
Other Commitments [Line Items]
Commitments	23,939	22,783
Commitments to extend credit | Credit card
Other Commitments [Line Items]
Commitments	33,932	33,066
Commitments to extend credit | Other
Other Commitments [Line Items]
Commitments	7,849	7,337
Standby letters of credit
Other Commitments [Line Items]
Commitments	10,157	10,575
Standby letters of credit | Remarketing Programs
Other Commitments [Line Items]
Commitments	3,400	3,600
Standby bond purchase agreements
Other Commitments [Line Items]
Commitments	1,184	1,208
Other commitments
Other Commitments [Line Items]
Commitments	$ 3,322	$ 3,661