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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 77,750 [1] $ 132,241
Available-for-sale securities, total, fair value [2] $ 68,523 [1] $ 132,963
Available-for-sale securities, total, weighted-average maturity in years 8 years [1] 5 years 6 months
Available-for-sale securities, total, weighted-average yield 2.53% [1],[3] 1.73%
Held-to-maturity securities, Amortized Cost $ 85,574 [1] $ 41,858
Held-to-maturity securities, total, fair value $ 74,128 [1] $ 41,812
Held-to-maturity securities, total, weighted-average maturity in years [1] 9 years 7 months 6 days  
Held-to-maturity securities, total, weighted-average yield 2.02% [1],[3] 1.45%
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 $ 1,172  
Available-for-sale securities, maturing after one year through five years, amortized cost 3,697  
Available-for-sale securities, maturing after five years through ten years, amortized cost 16,944  
Available-for-sale securities, maturing after ten years, amortized cost 2,657  
Available-for-sale securities, Amortized Cost 24,470 $ 36,648
Available-for-sale securities, maturing in one year or less, fair value 1,170  
Available-for-sale securities, maturing after one year through five years, fair value 3,382  
Available-for-sale securities, maturing after five years through ten years, fair value 15,024  
Available-for-sale securities, maturing after ten years, fair value 2,010  
Available-for-sale securities, total, fair value $ 21,586 36,609
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years 2 months 12 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 4 years 1 month 6 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 7 years 1 month 6 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years 11 years 7 months 6 days  
Available-for-sale securities, total, weighted-average maturity in years 6 years 9 months 18 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3] 2.05%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3] 1.95%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3] 2.27%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3] 1.99%  
Available-for-sale securities, total, weighted-average yield [3] 2.18%  
Held-to-maturity securities, maturing after one year through five years, amortized cost $ 1,344  
Held-to-maturity securities, Amortized Cost 1,344  
Held-to-maturity securities, maturing after one year through five years, fair value 1,288  
Held-to-maturity securities, total, fair value $ 1,288  
Held-to-maturity securities, maturing after one year through five years, weighted-average maturity in years 3 years 6 months  
Held-to-maturity securities, total, weighted-average maturity in years 3 years 6 months  
Held-to-maturity securities, maturing after one year through five years, weighted-average yield [3] 2.85%  
Held-to-maturity securities, total, weighted-average yield [3] 2.85%  
Mortgage-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing in one year or less, amortized cost [4] $ 34  
Available-for-sale securities, maturing after one year through five years, amortized cost [4] 11,601  
Available-for-sale securities, maturing after five years through ten years, amortized cost [4] 28,896  
Available-for-sale securities, maturing after ten years, amortized cost [4] 1,613  
Available-for-sale securities, Amortized Cost [4] 42,144  
Available-for-sale securities, maturing in one year or less, fair value [4] 33  
Available-for-sale securities, maturing after one year through five years, fair value [4] 10,724  
Available-for-sale securities, maturing after five years through ten years, fair value [4] 25,569  
Available-for-sale securities, maturing after ten years, fair value [4] 1,422  
Available-for-sale securities, total, fair value [4] $ 37,748  
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years [4] 9 months 18 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years [4] 3 years 2 months 12 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years [4] 7 years 9 months 18 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years [4] 11 years 3 months 18 days  
Available-for-sale securities, total, weighted-average maturity in years [4] 6 years 8 months 12 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3],[4] 2.84%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3],[4] 2.19%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3],[4] 2.52%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3],[4] 2.77%  
Available-for-sale securities, total, weighted-average yield [3],[4] 2.44%  
Held-to-maturity securities, maturing after five years through ten years, amortized cost [4] $ 50,750  
Held-to-maturity securities, maturing after ten years, amortized cost [4] 33,480  
Held-to-maturity securities, Amortized Cost [4] 84,230  
Held-to-maturity securities, maturing after five years through ten years, fair value [4] 44,735  
Held-to-maturity securities, maturing after ten years, fair value [4] 28,105  
Held-to-maturity securities, total, fair value [4] $ 72,840  
Held-to-maturity securities, maturing after five years through ten years, weighted-average maturity in years [4] 9 years 3 months 18 days  
Held-to-maturity securities, maturing after ten years, weighted-average maturity in years [4] 10 years 3 months 18 days  
Held-to-maturity securities, total, weighted-average maturity in years [4] 9 years 8 months 12 days  
Held-to-maturity securities, maturing after five years through ten years, weighted-average yield [3],[4] 2.06%  
Held-to-maturity securities, maturing after ten years, weighted-average yield [3],[4] 1.92%  
Held-to-maturity securities, total, weighted-average yield [3],[4] 2.01%  
Asset-Backed Securities [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing after five years through ten years, amortized cost $ 25  
Available-for-sale securities, Amortized Cost 25 62
Available-for-sale securities, maturing after five years through ten years, fair value 25  
Available-for-sale securities, total, fair value $ 25 66
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years 6 years 1 month 6 days  
Available-for-sale securities, total, weighted-average maturity in years 6 years 1 month 6 days  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3] 5.52%  
Available-for-sale securities, total, weighted-average yield [3] 5.52%  
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] $ 102  
Available-for-sale securities, maturing after one year through five years, amortized cost [5],[6] 402  
Available-for-sale securities, maturing after five years through ten years, amortized cost [5],[6] 442  
Available-for-sale securities, maturing after ten years, amortized cost [5],[6] 10,159  
Available-for-sale securities, Amortized Cost 11,105 [5],[6] 10,130
Available-for-sale securities, maturing in one year or less, fair value [5],[6] 102  
Available-for-sale securities, maturing after one year through five years, fair value [5],[6] 398  
Available-for-sale securities, maturing after five years through ten years, fair value [5],[6] 411  
Available-for-sale securities, maturing after ten years, fair value [5],[6] 8,247  
Available-for-sale securities, total, fair value $ 9,158 [5],[6] 10,717
Available-for-sale securities, maturing in one year or less, weighted-average maturity in years [5],[6] 3 months 18 days  
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years [5],[6] 3 years 6 months  
Available-for-sale securities, maturing after five years through ten years, weighted-average maturity in years [5],[6] 8 years 4 months 24 days  
Available-for-sale securities, maturing after ten years, weighted- average maturity in years [5],[6] 16 years 8 months 12 days  
Available-for-sale securities, total, weighted-average maturity in years [5],[6] 15 years 9 months 18 days  
Available-for-sale securities, maturing in one year or less, weighted-average yield [3],[5],[6] 4.73%  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3],[5],[6] 4.54%  
Available-for-sale securities, maturing after five years through ten years, weighted-average yield [3],[5],[6] 4.01%  
Available-for-sale securities, maturing after ten years, weighted-average yield [3],[5],[6] 3.60%  
Available-for-sale securities, total, weighted-average yield [3],[5],[6] 3.66%  
Other [Member]    
Contractual Maturities of Investment Securities [Line Items]    
Available-for-sale securities, maturing after one year through five years, amortized cost $ 6  
Available-for-sale securities, Amortized Cost 6 7
Available-for-sale securities, maturing after one year through five years, fair value 6  
Available-for-sale securities, total, fair value $ 6 $ 7
Available-for-sale securities, maturing after one year through five years, weighted-average maturity in years 2 years 8 months 12 days  
Available-for-sale securities, total, weighted-average maturity in years 2 years 8 months 12 days  
Available-for-sale securities, maturing after one year through five years, weighted-average yield [3] 1.99%  
Available-for-sale securities, total, weighted-average yield [3] 1.99%  
[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] 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, excluding any premiums or discounts recorded related to the transfer of investment securities at fair value from available-for-sale to held-to-maturity.
[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.