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Investment Securities - Available-for-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost $ 124,513 [1] $ 122,117
Available-for-sale securities, Unrealized Gains 3,646 944
Available-for-sale securities, Unrealized Losses (39) (448)
Available-for-sale securities, Fair Value [2] 128,120 [1] 122,613
U.S. Treasury and Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 19,397 19,845
Available-for-sale securities, Unrealized Gains 581 61
Available-for-sale securities, Unrealized Losses   (67)
Available-for-sale securities, Fair Value 19,978 19,839
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 94,193 93,903
Available-for-sale securities, Unrealized Gains 2,347 557
Available-for-sale securities, Unrealized Losses (38) (349)
Available-for-sale securities, Fair Value 96,502 94,111
Commercial Agency [Member] | Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 3,079 1,482
Available-for-sale securities, Unrealized Gains 184  
Available-for-sale securities, Unrealized Losses   (29)
Available-for-sale securities, Fair Value 3,263 1,453
Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost [3] 361  
Available-for-sale securities, Fair Value [3] 368  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, Unrealized Gains 1 1
Available-for-sale securities, Fair Value 1 1
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 361 375
Available-for-sale securities, Unrealized Gains 6 7
Available-for-sale securities, Fair Value 367 382
Obligations of State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 7,470 [4],[5] 6,499
Available-for-sale securities, Unrealized Gains 527 318
Available-for-sale securities, Unrealized Losses (1) (3)
Available-for-sale securities, Fair Value 7,996 [4],[5] 6,814
Obligations of Foreign Governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 9 9
Available-for-sale securities, Fair Value 9 9
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 4 4
Available-for-sale securities, Fair Value $ 4 $ 4
[1] The weighted-average maturity of total available-for-sale investment securities was 4.2 years at December 31, 2019, with a corresponding weighted-average yield of 2.38 percent.
[2] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.
[3] Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities that take into account anticipated future prepayments.
[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.