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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value $ 34,659 $ 40,672
Securities available-for-sale, unrealized losses (350) (72)
Securities available-for-sale, unrealized gains 549 1,109
Securities available-for-sale, allowance for credit losses [1] (1) (1)
Securities available-for-sale, amortized cost 34,461 39,636
Securities held-to-maturity, fair value 8,166 9,369
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 329 388
Securities held-to-maturity, allowance for credit losses [1] (2) (2)
Securities held-to-maturity, amortized cost 7,839 8,983
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 13,690 16,648
Securities available-for-sale, unrealized losses (146) (47)
Securities available-for-sale, unrealized gains 262 608
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 13,574 16,087
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 6,750 6,264
Securities available-for-sale, unrealized losses (103) (2)
Securities available-for-sale, unrealized gains 153 280
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 6,700 5,986
Securities held-to-maturity, fair value 1,040 1,181
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 39 44
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, amortized cost 1,001 1,137
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 1,864 1,693
Securities available-for-sale, unrealized losses (48) (2)
Securities available-for-sale, unrealized gains 8 19
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 1,904 1,676
Securities held-to-maturity, fair value 746 833
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 46 53
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, amortized cost 700 780
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 1,337 1,253
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, unrealized gains 19 17
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 1,318 1,236
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 5,755 7,145
Securities available-for-sale, unrealized losses (38) 0
Securities available-for-sale, unrealized gains 76 152
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 5,717 6,993
Securities held-to-maturity, fair value 1,732 2,023
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 58 76
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, amortized cost 1,674 1,947
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 1,830 2,104
Securities available-for-sale, unrealized losses (12) (11)
Securities available-for-sale, unrealized gains 18 22
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 1,824 2,093
Securities held-to-maturity, fair value 4,637 5,319
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 183 212
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, amortized cost 4,454 5,107
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 282 301
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, unrealized gains 9 5
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 273 296
Obligations of U.S. states and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 9 11
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 1 1
Securities held-to-maturity, allowance for credit losses 0 0
Securities held-to-maturity, amortized cost 8 10
Residential mortgage asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 2 2
Securities held-to-maturity, unrealized losses 0 0
Securities held-to-maturity, unrealized gain 2 2
Securities held-to-maturity, allowance for credit losses (2) (2)
Securities held-to-maturity, amortized cost 2 2
Home Equity Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 25 27
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, unrealized gains 0 0
Securities available-for-sale, allowance for credit losses (1) (1)
Securities available-for-sale, amortized cost 26 28
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 105 104
Securities available-for-sale, unrealized losses (3) (10)
Securities available-for-sale, unrealized gains 0 0
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost 108 114
Foreign debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value [2] 3,021 5,133
Securities available-for-sale, unrealized losses [2] 0 0
Securities available-for-sale, unrealized gains [2] 4 6
Securities available-for-sale, allowance for credit losses 0 0
Securities available-for-sale, amortized cost [2] $ 3,017 $ 5,127
[1] See Note 4, "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.