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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 120,447 [1] $ 122,117
Available-for-sale securities, total, fair value [2] $ 123,681 [1] $ 122,613
Available-for-sale securities, total, weighted-average maturity in years 3 years 4 months 24 days [1] 4 years 2 months 12 days
Available-for-sale securities, total, weighted-average yield 2.33% [1],[3] 2.38%
U.S. Treasury and Agencies [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost $ 4,745  
Available-for-sale securities, maturing after one year through five years, amortized cost 10,977  
Available-for-sale securities, maturing after five years through ten years, amortized cost 2,796  
Available-for-sale securities, Amortized Cost 18,518 $ 19,845
Available-for-sale securities, maturing in one year or less, fair value 4,784  
Available-for-sale securities, maturing after one year through five years, fair value 11,339  
Available-for-sale securities, maturing after five years through ten years, fair value 2,986  
Available-for-sale securities, total, fair value $ 19,109 19,839
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 6 months  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 2 years 3 months 18 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 7 years 3 months 18 days  
Available-for-sale securities, total, weighted-average maturity in years 2 years 7 months 6 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3] 1.62%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3] 1.65%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3] 1.94%  
Available-for-sale securities, total, weighted-average yield [3] 1.69%  
Mortgage-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost [4] $ 193  
Available-for-sale securities, maturing after one year through five years, amortized cost [4] 88,861  
Available-for-sale securities, maturing after five years through ten years, amortized cost [4] 5,333  
Available-for-sale securities, maturing after ten years, amortized cost [4] 102  
Available-for-sale securities, Amortized Cost [4] 94,489  
Available-for-sale securities, maturing in one year or less, fair value [4] 193  
Available-for-sale securities, maturing after one year through five years, fair value [4] 91,022  
Available-for-sale securities, maturing after five years through ten years, fair value [4] 5,417  
Available-for-sale securities, maturing after ten years, fair value [4] 101  
Available-for-sale securities, total, fair value [4] $ 96,733  
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 7 months 6 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years [4] 3 years 1 month 6 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years [4] 7 years 3 months 18 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years [4] 12 years 1 month 6 days  
Available-for-sale securities, total, weighted-average maturity in years [4] 3 years 4 months 24 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3],[4] 2.28%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3],[4] 2.33%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3],[4] 1.83%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3],[4] 2.21%  
Available-for-sale securities, total, weighted-average yield [3],[4] 2.31%  
Asset-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing after one year through five years, amortized cost [4] $ 367  
Available-for-sale securities, Amortized Cost [4] 367  
Available-for-sale securities, maturing after one year through five years, fair value [4] 373  
Available-for-sale securities, maturing after five years through ten years, fair value [4] 1  
Available-for-sale securities, maturing after ten years, fair value [4] 2  
Available-for-sale securities, total, fair value [4] $ 376  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years [4] 3 years  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years [4] 6 years  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years [4] 13 years 9 months 18 days  
Available-for-sale securities, total, weighted-average maturity in years [4] 3 years  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3],[4] 3.05%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3],[4] 1.52%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3],[4] 2.41%  
Available-for-sale securities, total, weighted-average yield [3],[4] 3.04%  
Obligations of State and Political Subdivisions [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost [5],[6] $ 32  
Available-for-sale securities, maturing after one year through five years, amortized cost [5],[6] 852  
Available-for-sale securities, maturing after five years through ten years, amortized cost [5],[6] 6,004  
Available-for-sale securities, maturing after ten years, amortized cost [5],[6] 176  
Available-for-sale securities, Amortized Cost 7,064 [5],[6] 6,499
Available-for-sale securities, maturing in one year or less, fair value [5],[6] 33  
Available-for-sale securities, maturing after one year through five years, fair value [5],[6] 884  
Available-for-sale securities, maturing after five years through ten years, fair value [5],[6] 6,358  
Available-for-sale securities, maturing after ten years, fair value [5],[6] 179  
Available-for-sale securities, total, fair value $ 7,454 [5],[6] $ 6,814
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 1 month 6 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years [5],[6] 2 years 8 months 12 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years [5],[6] 7 years  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years [5],[6] 12 years 7 months 6 days  
Available-for-sale securities, total, weighted-average maturity in years [5],[6] 6 years 7 months 6 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3],[5],[6] 6.01%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3],[5],[6] 4.39%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3],[5],[6] 4.21%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3],[5],[6] 4.21%  
Available-for-sale securities, total, weighted-average yield [3],[5],[6] 4.24%  
Other Debt Securities and Obligations of Foreign Governments [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost $ 9  
Available-for-sale securities, Amortized Cost 9  
Available-for-sale securities, maturing in one year or less, fair value 9  
Available-for-sale securities, total, fair value $ 9  
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 3 months 18 days  
Available-for-sale securities, total, weighted-average maturity in years 3 months 18 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3] 2.44%  
Available-for-sale securities, total, weighted-average yield [3] 2.44%  
[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] Weighted-average yields for obligations of state and political subdivisions are presented on a fully-taxable equivalent basis based on a federal income tax rate of 21 percent. Yields on investment securities are computed based on amortized cost balances.
[4] Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities that take into account anticipated future prepayments.
[5] 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.
[6] 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.