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Investment Securities - Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost [1] $ 41,858  
Held-to-maturity securities, Unrealized Gains 2  
Held-to-maturity securities, Unrealized Losses (48)  
Held-to-maturity securities, Fair Value [1] 41,812  
Available-for-sale Securities, Amortized Cost 132,241 [2] $ 133,611
Available-for-sale securities, Unrealized Gains 1,534 3,282
Available-for-sale securities, Unrealized Losses (812) (53)
Available-for-sale securities, Fair Value [3] 132,963 [2] 136,840
U.S. Treasury and Agencies [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 36,648 21,954
Available-for-sale securities, Unrealized Gains 205 462
Available-for-sale securities, Unrealized Losses (244) (25)
Available-for-sale securities, Fair Value 36,609 22,391
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost 41,858  
Held-to-maturity securities, Unrealized Gains 2  
Held-to-maturity securities, Unrealized Losses (48)  
Held-to-maturity securities, Fair Value 41,812  
Available-for-sale Securities, Amortized Cost 76,761 98,031
Available-for-sale securities, Unrealized Gains 665 1,950
Available-for-sale securities, Unrealized Losses (347) (13)
Available-for-sale securities, Fair Value 77,079 99,968
Commercial [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 8,633 5,251
Available-for-sale securities, Unrealized Gains 53 170
Available-for-sale securities, Unrealized Losses (201) (15)
Available-for-sale securities, Fair Value 8,485 5,406
Asset-Backed Securities [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 62 [1] 200
Available-for-sale securities, Unrealized Gains 4 5
Available-for-sale securities, Fair Value 66 [1] 205
Obligations of State and Political Subdivisions [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 10,130 [4],[5] 8,166
Available-for-sale securities, Unrealized Gains 607 695
Available-for-sale securities, Unrealized Losses (20)  
Available-for-sale securities, Fair Value 10,717 [4],[5] 8,861
Other [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 7 9
Available-for-sale securities, Fair Value $ 7 $ 9
[1] Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities that take into account anticipated future prepayments.
[2] The weighted-average maturity of total available-for-sale investment securities was 3.4 years at December 31, 2020, with a corresponding weighted-average yield of 1.61 percent.
[3] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.
[4] 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.
[5] 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.