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Business Combinations - Summary of Other Intangible Assets (Detail) - MUFG Union Bank [Member]
$ in Millions
Dec. 01, 2022
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair Value $ 2,883
Mortgage servicing rights [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Fair Value $ 147 [1]
Core deposit benefits [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Estimated Life 10 years
Amortization Method Accelerated
Fair Value $ 2,710
Other [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Estimated Life 11 years
Amortization Method Accelerated
Fair Value $ 26
[1] Mortgage servicing rights are recorded at fair value and are not amortized.