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Commitments (Other Commitments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Other Commitments [Line Items]    
Commitments $ 255,817 $ 220,368
Liability Related To Investments In Low Income Housing Tax Credits 1,500 1,100
Commitments to extend credit    
Other Commitments [Line Items]    
Commitments 241,434 207,821
Commitments to extend credit | BBVA USA Bancshares, Inc.    
Other Commitments [Line Items]    
Commitments 28,300  
Commitments to extend credit | Total commercial    
Other Commitments [Line Items]    
Commitments 176,396 153,089
Commitments to extend credit | Home equity lines of credit    
Other Commitments [Line Items]    
Commitments 19,301 16,626
Commitments to extend credit | Credit card    
Other Commitments [Line Items]    
Commitments 35,092 31,019
Commitments to extend credit | Other    
Other Commitments [Line Items]    
Commitments 10,645 7,087
Standby letters of credit    
Other Commitments [Line Items]    
Commitments 9,803 9,053
Standby letters of credit | Remarketing Programs    
Other Commitments [Line Items]    
Commitments 3,700 3,800
Standby bond purchase agreements    
Other Commitments [Line Items]    
Commitments 1,516 1,448
Other commitments    
Other Commitments [Line Items]    
Commitments $ 3,064 $ 2,046