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Accounting Policies (Details)
$ in Millions
Jun. 01, 2021
USD ($)
Dec. 31, 2023
USD ($)
office
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 12, 2021
state
branch
customer
employee
Dec. 31, 2020
USD ($)
Number of international offices | office   4        
Number of customers converted | customer         2,600,000  
Number of employees converted | employee         9,000  
Number of branches converted | branch         600  
Number of states converted | state         7  
Allowance for loan and lease losses   $ (4,791) $ (4,741) $ (4,868)   $ (5,361)
Retained earnings   $ 56,290 53,572      
BBVA USA Bancshares, Inc.            
Business combination, consideration transferred $ 11,500          
Cumulative Effect, Period of Adoption, Adjustment            
Allowance for loan and lease losses     35  
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02            
Allowance for loan and lease losses     35      
Retained earnings     $ 26      
Minimum | Furniture and Equipment            
Estimated useful life of property and equipment   1 year        
Minimum | Software and Software Development Costs            
Estimated useful life of property and equipment   1 year        
Maximum | Furniture and Equipment            
Estimated useful life of property and equipment   10 years        
Maximum | Buildings            
Estimated useful life of property and equipment   40 years        
Maximum | Leasehold Improvements            
Estimated useful life of property and equipment   15 years        
Maximum | Software and Software Development Costs            
Estimated useful life of property and equipment   10 years