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Investment Securities - Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost $ 61,503 [1] $ 41,858
Held-to-maturity securities, Unrealized Gains 2 2
Held-to-maturity securities, Unrealized Losses (5,848) (48)
Held-to-maturity securities, Fair Value 55,657 [1] 41,812
Available-for-sale Securities, Amortized Cost 108,255 132,241
Available-for-sale securities, Unrealized Gains 34 1,534
Available-for-sale securities, Unrealized Losses (9,483) (812)
Available-for-sale securities, Fair Value [2] 98,806 132,963
U.S. Treasury and Agencies [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost 1,343  
Held-to-maturity securities, Unrealized Losses (6)  
Held-to-maturity securities, Fair Value 1,337  
Available-for-sale Securities, Amortized Cost 25,779 36,648
Available-for-sale securities, Unrealized Gains   205
Available-for-sale securities, Unrealized Losses (2,012) (244)
Available-for-sale securities, Fair Value 23,767 36,609
Residential Mortgage-Backed Securities [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Held-to-maturity securities, Amortized Cost 60,160 41,858
Held-to-maturity securities, Unrealized Gains 2 2
Held-to-maturity securities, Unrealized Losses (5,842) (48)
Held-to-maturity securities, Fair Value 54,320 41,812
Available-for-sale Securities, Amortized Cost 62,788 76,761
Available-for-sale securities, Unrealized Gains 23 665
Available-for-sale securities, Unrealized Losses (5,059) (347)
Available-for-sale securities, Fair Value 57,752 77,079
Commercial [Member] | Agency [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 8,756 8,633
Available-for-sale securities, Unrealized Gains   53
Available-for-sale securities, Unrealized Losses (1,192) (201)
Available-for-sale securities, Fair Value 7,564 8,485
Asset-Backed Securities [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost   62
Available-for-sale securities, Unrealized Gains   4
Available-for-sale securities, Fair Value   66
Obligations of State and Political Subdivisions [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 10,925 10,130
Available-for-sale securities, Unrealized Gains 11 607
Available-for-sale securities, Unrealized Losses (1,220) (20)
Available-for-sale securities, Fair Value 9,716 10,717
Other [Member]    
Debt Securities Available For Sale And Held To Maturity [Line Items]    
Available-for-sale Securities, Amortized Cost 7 7
Available-for-sale securities, Fair Value $ 7 $ 7
[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.