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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 3,820 $ 460
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 22 4
Estimated fair value, 12 months or more 7,690 9,917
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 242 247
Held to maturity, Estimated fair value, Less than 12 months 1,397 1,551
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 22 23
Held to maturity, Estimated fair value, 12 months or more 12,410 11,844
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 1,200 1,012
Total investment securities, fair value less than 12 months 5,217 2,011
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses 44 27
Total of investment securities, fair value, 12 Months or More 20,100 21,761
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses 1,442 1,259
U.S. Treasury and Federal Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 2,242 229
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 10 1
Estimated fair value, 12 months or more 5,177 7,474
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 89 112
Held to maturity, Estimated fair value, Less than 12 months 49 50
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 1  
Held to maturity, Estimated fair value, 12 months or more 925 924
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 32 31
Commercial [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 765 74
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 6 1
Estimated fair value, 12 months or more 393 330
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 7 8
Held to maturity, Estimated fair value, Less than 12 months 172 328
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 9 9
Held to maturity, Estimated fair value, 12 months or more 1,709 1,575
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 145 121
Residential [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 813 151
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 6 2
Estimated fair value, 12 months or more 1,964 1,959
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 137 116
Held to maturity, Estimated fair value, Less than 12 months 1,133 955
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 12 11
Held to maturity, Estimated fair value, 12 months or more 7,459 7,139
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 923 791
Obligations of States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, Less than 12 months 43 218
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses   3
Held to maturity, Estimated fair value, 12 months or more 2,284 2,172
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 94 64
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months   6
Estimated fair value, 12 months or more 156 154
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 9 11
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, 12 months or more 33 34
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ 6 $ 5