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Capitalized Servicing Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2022
Dec. 31, 2024
Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]      
Purchase of residential mortgage loans     $ 350
Loans and leases   $ 135,581 $ 134,068
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   12.80% 14.43%
Residential Mortgage Loans      
Servicing Assets at Fair Value [Line Items]      
Fair value of residential loan servicing assets   $ 612 $ 611
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   11.64% 11.45%
Discounted rate represented weighted-average option-adjusted basis spread point percentage   7.58% 7.90%
Residential Real Estate      
Servicing Assets at Fair Value [Line Items]      
Loans and leases     $ 19,500
Fair value of residential loan servicing assets $ 1,100    
Purchase price of servicing rights $ 12    
Commercial Mortgage Loans      
Servicing Assets at Fair Value [Line Items]      
Fair value of residential loan servicing assets   $ 194 $ 193
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   12.80%