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Goodwill and Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance $ 3,423    
Mortgage servicing rights, ending balance 3,686 $ 3,423  
Mortgage Servicing Rights | Commercial real estate      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 1,113 740 $ 569
Mortgage servicing rights, ending balance 1,032 1,113 740
Unpaid principal balance of loans serviced for others at end of period 288,042 281,277 272,556
Servicing advances 561 421 463
Mortgage Servicing Rights | Commercial real estate | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (332) (208) (119)
Mortgage Servicing Rights | Commercial real estate | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value 157 473 162
Mortgage Servicing Rights | Commercial real estate | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 50 62 87
Mortgage Servicing Rights | Commercial real estate | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 44 46 41
Mortgage Servicing Rights | Residential Mortgages      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Mortgage servicing rights, beginning balance 2,310 1,078 673
Mortgage servicing rights, ending balance 2,654 2,310 1,078
Unpaid principal balance of loans serviced for others at end of period 209,158 189,831 132,953
Servicing advances 172 165 176
Mortgage Servicing Rights | Residential Mortgages | Time and Payoffs      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (237) (231) (320)
Mortgage Servicing Rights | Residential Mortgages | Other      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value 115 509 192
Mortgage Servicing Rights | Residential Mortgages | Sale      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Changes in Fair Value (1)    
Mortgage Servicing Rights | Residential Mortgages | BBVA USA Bancshares, Inc.      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions   35
Mortgage Servicing Rights | Residential Mortgages | From loans sold with servicing retained      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions 23 57 87
Mortgage Servicing Rights | Residential Mortgages | Purchases      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions $ 444 $ 897 $ 411