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Fee-Based Revenue from Contracts with Customers - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Business Acquisition [Line Items]        
Segment reporting, number of segments | segment     3  
Noninterest income $ 2,086 $ 1,549 $ 3,958 $ 3,374
Asset Management Fees        
Business Acquisition [Line Items]        
Noninterest income 239   465  
Brokerage fees        
Business Acquisition [Line Items]        
Noninterest income 2   2  
BBVA USA Bancshares, Inc.        
Business Acquisition [Line Items]        
Brokerage account client assets $ 5,400   5,400  
BBVA USA Bancshares, Inc. | Brokerage fees        
Business Acquisition [Line Items]        
Noninterest income     $ 2