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Investment Securities - Available-for-Sale (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost $ 120,447 [1] $ 122,117
Available-for-sale securities, Unrealized Gains 3,386 944
Available-for-sale securities, Unrealized Losses (152) (448)
Available-for-sale securities, Fair Value [2] 123,681 [1] 122,613
U.S. Treasury and Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 18,518 19,845
Available-for-sale securities, Unrealized Gains 592 61
Available-for-sale securities, Unrealized Losses (1) (67)
Available-for-sale securities, Fair Value 19,109 19,839
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 91,962 93,903
Available-for-sale securities, Unrealized Gains 2,297 557
Available-for-sale securities, Unrealized Losses (150) (349)
Available-for-sale securities, Fair Value 94,109 94,111
Commercial Agency [Member] | Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 2,527 1,482
Available-for-sale securities, Unrealized Gains 97  
Available-for-sale securities, Unrealized Losses   (29)
Available-for-sale securities, Fair Value 2,624 1,453
Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost [3] 367  
Available-for-sale securities, Fair Value [3] 376  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, Unrealized Gains 2 1
Available-for-sale securities, Fair Value 2 1
Asset-Backed Securities [Member] | Other Asset-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 367 375
Available-for-sale securities, Unrealized Gains 7 7
Available-for-sale securities, Fair Value 374 382
Obligations of State and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 7,064 [4],[5] 6,499
Available-for-sale securities, Unrealized Gains 391 318
Available-for-sale securities, Unrealized Losses (1) (3)
Available-for-sale securities, Fair Value 7,454 [4],[5] 6,814
Obligations of Foreign Governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost 5 9
Available-for-sale securities, Fair Value 5 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.