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Investment Securities - Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost $ 85,574 [1] $ 41,858
Held-to-maturity securities, Unrealized Gains   2
Held-to-maturity securities, Unrealized Losses (11,446) (48)
Held-to-maturity securities, Fair Value 74,128 [1] 41,812
Available-for-sale Securities, Amortized Cost 77,750 [1] 132,241
Available-for-sale securities, Unrealized Gains 14 1,534
Available-for-sale securities, Unrealized Losses (9,241) (812)
Available-for-sale securities, Fair Value [2] 68,523 [1] 132,963
U.S. Treasury and Agencies [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost 1,344  
Held-to-maturity securities, Unrealized Losses (56)  
Held-to-maturity securities, Fair Value 1,288  
Available-for-sale Securities, Amortized Cost 24,470 36,648
Available-for-sale securities, Unrealized Gains   205
Available-for-sale securities, Unrealized Losses (2,884) (244)
Available-for-sale securities, Fair Value 21,586 36,609
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost 84,230 41,858
Held-to-maturity securities, Unrealized Gains   2
Held-to-maturity securities, Unrealized Losses (11,390) (48)
Held-to-maturity securities, Fair Value 72,840 41,812
Available-for-sale Securities, Amortized Cost 33,398 76,761
Available-for-sale securities, Unrealized Gains 12 665
Available-for-sale securities, Unrealized Losses (2,753) (347)
Available-for-sale securities, Fair Value 30,657 77,079
Commercial [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 8,746 8,633
Available-for-sale securities, Unrealized Gains   53
Available-for-sale securities, Unrealized Losses (1,655) (201)
Available-for-sale securities, Fair Value 7,091 8,485
Asset-Backed Securities [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 25 62
Available-for-sale securities, Unrealized Gains   4
Available-for-sale securities, Fair Value 25 66
Obligations of State and Political Subdivisions [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 11,105 [3],[4] 10,130
Available-for-sale securities, Unrealized Gains 2 607
Available-for-sale securities, Unrealized Losses (1,949) (20)
Available-for-sale securities, Fair Value 9,158 [3],[4] 10,717
Other [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 6 7
Available-for-sale securities, Fair Value $ 6 $ 7
[1] The weighted-average maturity of total held-to-maturity investment securities was 7.4 years at December 31, 2021, with a corresponding weighted-average yield of 1.45 percent. The weighted-average maturity of total available-for-sale investment securities was 5.5 years at December 31, 2021, with a corresponding weighted-average yield of 1.73 percent.
[2] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.
[3] Information related to obligations of state and political subdivisions is presented based upon yield to first optional call date if the security is purchased at a premium, and yield to maturity if the security is purchased at par or a discount.
[4] Maturity calculations for obligations of state and political subdivisions are based on the first optional call date for securities with a fair value above par and the contractual maturity date for securities with a fair value equal to or below par.