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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value $ 40,672   $ 35,663
Securities available-for-sale, unrealized losses (72)   (330)
Securities available-for-sale, unrealized gains 1,109   261
Securities available-for-sale, allowance for credit losses [2] (1) [1] $ (3)  
Securities available-for-sale, amortized cost 39,636    
Securities available-for-sale, amortized cost     35,732
Securities held-to-maturity, fair value 9,369   13,431
Securities held-to-maturity, unrealized losses 0   (27)
Securities held-to-maturity, unrealized gain 388   165
Securities held-to-maturity, allowance for credit losses [2] (2) [1] $ (2)  
Securities held-to-maturity, amortized cost 8,983    
Securities held-to-maturity, amortized cost     13,293
US Treasury Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 16,648   16,078
Securities available-for-sale, unrealized losses (47)   (269)
Securities available-for-sale, unrealized gains 608   128
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 16,087    
Securities available-for-sale, amortized cost     16,219
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 6,264   3,402
Securities available-for-sale, unrealized losses (2)   (13)
Securities available-for-sale, unrealized gains 280   57
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 5,986    
Securities available-for-sale, amortized cost     3,358
Securities held-to-maturity, fair value 1,181   1,653
Securities held-to-maturity, unrealized losses 0   (1)
Securities held-to-maturity, unrealized gain 44   22
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 1,137    
Securities held-to-maturity, amortized cost     1,632
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 1,693   347
Securities available-for-sale, unrealized losses (2)   (1)
Securities available-for-sale, unrealized gains 19   3
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 1,676    
Securities available-for-sale, amortized cost     345
Securities held-to-maturity, fair value 833   1,454
Securities held-to-maturity, unrealized losses 0   (4)
Securities held-to-maturity, unrealized gain 53   40
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 780    
Securities held-to-maturity, amortized cost     1,418
Direct Agency Obligations U S Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 1,253   1,403
Securities available-for-sale, unrealized losses 0   0
Securities available-for-sale, unrealized gains 17   21
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 1,236    
Securities available-for-sale, amortized cost     1,382
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 7,145   9,997
Securities available-for-sale, unrealized losses 0   (41)
Securities available-for-sale, unrealized gains 152   29
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 6,993    
Securities available-for-sale, amortized cost     10,009
Securities held-to-maturity, fair value 2,023   3,021
Securities held-to-maturity, unrealized losses 0   0
Securities held-to-maturity, unrealized gain 76   17
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 1,947    
Securities held-to-maturity, amortized cost     3,004
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 2,104   747
Securities available-for-sale, unrealized losses (11)   (4)
Securities available-for-sale, unrealized gains 22   10
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 2,093    
Securities available-for-sale, amortized cost     741
Securities held-to-maturity, fair value 5,319   7,290
Securities held-to-maturity, unrealized losses 0   (22)
Securities held-to-maturity, unrealized gain 212   85
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 5,107    
Securities held-to-maturity, amortized cost     7,227
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 301   260
Securities available-for-sale, unrealized losses 0   0
Securities available-for-sale, unrealized gains 5   6
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 296    
Securities available-for-sale, amortized cost     254
Obligations of U.S. states and political subdivisions [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities held-to-maturity, fair value 11   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 [1] 0    
Securities held-to-maturity, amortized cost 10    
Securities held-to-maturity, amortized cost     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   0
Securities held-to-maturity, allowance for credit losses [1] (2)    
Securities held-to-maturity, amortized cost 2    
Securities held-to-maturity, amortized cost     2
Home Equity Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 27   32
Securities available-for-sale, unrealized losses 0   (2)
Securities available-for-sale, unrealized gains 0   0
Securities available-for-sale, allowance for credit losses [1] (1)    
Securities available-for-sale, amortized cost 28    
Securities available-for-sale, amortized cost     34
Other securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 104   111
Securities available-for-sale, unrealized losses (10)   0
Securities available-for-sale, unrealized gains 0   3
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 114    
Securities available-for-sale, amortized cost     108
Foreign debt securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value [3] 5,133   3,286
Securities available-for-sale, unrealized losses [3] 0   0
Securities available-for-sale, unrealized gains [3] 6   4
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost [3] $ 5,127    
Securities available-for-sale, amortized cost [3]     $ 3,282
[1] As discussed in Note 2, "Summary of Significant Accounting Policies and New Accounting Pronouncements," beginning January 1, 2020, an allowance for credit losses is recognized for debt securities while, prior to January 1, 2020, debt securities were assessed for other-than-temporary impairment. At December 31, 2019, we did not consider any of our debt securities to be other-than-temporarily impaired.
[2] See Note 5, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios.
[3] Foreign debt securities represent public sector entity, bank or corporate debt.