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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost $ 36,352 $ 39,636
Securities available-for-sale, allowance for credit losses (1) (1) [1]
Securities available-for-sale, unrealized gains 449 1,109
Securities available-for-sale, unrealized losses (293) (72)
Securities available-for-sale, fair value 36,507 40,672
Securities, held-to-maturity, amortized cost 5,867 8,983
Securities held-to-maturity, allowance for credit losses [1] (1) (2)
Securities held-to-maturity, unrealized gain 231 388
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 6,097 9,369
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 12,510 16,087
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 216 608
Securities available-for-sale, unrealized losses (90) (47)
Securities available-for-sale, fair value 12,636 16,648
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 7,735 5,986
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 154 280
Securities available-for-sale, unrealized losses (94) (2)
Securities available-for-sale, fair value 7,795 6,264
Securities, held-to-maturity, amortized cost 735 1,137
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, unrealized gain 30 44
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 765 1,181
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 1,831 1,676
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 9 19
Securities available-for-sale, unrealized losses (37) (2)
Securities available-for-sale, fair value 1,803 1,693
Securities, held-to-maturity, amortized cost 550 780
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, unrealized gain 35 53
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 585 833
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 1,449 1,236
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 19 17
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, fair value 1,468 1,253
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 7,172 6,993
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 30 152
Securities available-for-sale, unrealized losses (41) 0
Securities available-for-sale, fair value 7,161 7,145
Securities, held-to-maturity, amortized cost 1,250 1,947
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, unrealized gain 39 76
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 1,289 2,023
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 2,989 2,093
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 11 22
Securities available-for-sale, unrealized losses (24) (11)
Securities available-for-sale, fair value 2,976 2,104
Securities, held-to-maturity, amortized cost 3,322 5,107
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, unrealized gain 126 212
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 3,448 5,319
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 280 296
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 7 5
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, fair value 287 301
Home Equity Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 21 28
Securities available-for-sale, allowance for credit losses (1) (1)
Securities available-for-sale, unrealized gains 0 0
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, fair value 20 27
Asset-backed Securities Available-for-sale [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 108 114
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains 0 0
Securities available-for-sale, unrealized losses (7) (10)
Securities available-for-sale, fair value 101 104
Foreign debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost [2] 2,257 5,127
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, unrealized gains [2] 3 6
Securities available-for-sale, unrealized losses [2] 0 0
Securities available-for-sale, fair value [2] 2,260 5,133
Obligations of U.S. states and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities, held-to-maturity, amortized cost 9 10
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, unrealized gain 0 1
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value 9 11
Residential mortgage asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities, held-to-maturity, amortized cost 1 2
Securities held-to-maturity, allowance for credit losses (1) (2)
Securities held-to-maturity, unrealized gain 1 2
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, fair value $ 1 $ 2
[1] See Note 5, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios.
[2] Foreign debt securities represent public sector entity, bank or corporate debt.