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Commitments (Other Commitments) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Other Commitments [Line Items]    
Commitments $ 262,400 $ 250,854
Liability Related To Investments In Low Income Housing Tax Credits 2,100 2,000
Commitments to extend credit    
Other Commitments [Line Items]    
Commitments 248,212 237,238
Commitments to extend credit | Commercial    
Other Commitments [Line Items]    
Commitments 186,684 176,248
Commitments to extend credit | Home equity lines of credit    
Other Commitments [Line Items]    
Commitments 20,547 19,410
Commitments to extend credit | Credit card    
Other Commitments [Line Items]    
Commitments 32,873 32,499
Commitments to extend credit | Other    
Other Commitments [Line Items]    
Commitments 8,108 9,081
Standby letters of credit    
Other Commitments [Line Items]    
Commitments 9,821 9,303
Standby letters of credit | Remarketing Programs    
Other Commitments [Line Items]    
Commitments 3,900 3,300
Standby bond purchase agreements    
Other Commitments [Line Items]    
Commitments 1,250 1,268
Other commitments    
Other Commitments [Line Items]    
Commitments $ 3,117 $ 3,045