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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value $ 40,792   $ 35,663
Securities available-for-sale, unrealized losses (251)   (330)
Securities available-for-sale, unrealized gains 1,178   261
Securities available-for-sale, allowance for credit losses [2] (2) [1] $ (3)  
Securities available-for-sale, amortized cost 39,867    
Securities available-for-sale, amortized cost     35,732
Securities held-to-maturity, fair value 13,446   13,431
Securities held-to-maturity, unrealized losses (4)   (27)
Securities held-to-maturity, unrealized gain 469   165
Securities held-to-maturity, allowance for credit losses [2] (2) [1] $ (2)  
Securities held-to-maturity, amortized cost 12,983    
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 17,291   16,078
Securities available-for-sale, unrealized losses (209)   (269)
Securities available-for-sale, unrealized gains 607   128
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 16,893    
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 4,915   3,402
Securities available-for-sale, unrealized losses (1)   (13)
Securities available-for-sale, unrealized gains 219   57
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 4,697    
Securities available-for-sale, amortized cost     3,358
Securities held-to-maturity, fair value 1,614   1,653
Securities held-to-maturity, unrealized losses 0   (1)
Securities held-to-maturity, unrealized gain 53   22
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 1,561    
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 277   347
Securities available-for-sale, unrealized losses (1)   (1)
Securities available-for-sale, unrealized gains 16   3
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 262    
Securities available-for-sale, amortized cost     345
Securities held-to-maturity, fair value 1,358   1,454
Securities held-to-maturity, unrealized losses 0   (4)
Securities held-to-maturity, unrealized gain 69   40
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 1,289    
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 1,844   1,403
Securities available-for-sale, unrealized losses (14)   0
Securities available-for-sale, unrealized gains 9   21
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 1,849    
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 10,488   9,997
Securities available-for-sale, unrealized losses (2)   (41)
Securities available-for-sale, unrealized gains 276   29
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 10,214    
Securities available-for-sale, amortized cost     10,009
Securities held-to-maturity, fair value 2,895   3,021
Securities held-to-maturity, unrealized losses 0   0
Securities held-to-maturity, unrealized gain 90   17
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 2,805    
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 1,323   747
Securities available-for-sale, unrealized losses (1)   (4)
Securities available-for-sale, unrealized gains 42   10
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 1,282    
Securities available-for-sale, amortized cost     741
Securities held-to-maturity, fair value 7,567   7,290
Securities held-to-maturity, unrealized losses (4)   (22)
Securities held-to-maturity, unrealized gain 255   85
Securities held-to-maturity, allowance for credit losses [1] 0    
Securities held-to-maturity, amortized cost 7,316    
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 279   260
Securities available-for-sale, unrealized losses (11)   0
Securities available-for-sale, unrealized gains 0   6
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 290    
Securities available-for-sale, amortized cost     254
Obligations of U.S. states and political subdivision [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities held-to-maturity, fair value 10   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] (1)    
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 1   0
Securities held-to-maturity, allowance for credit losses [1] (1)    
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 28   32
Securities available-for-sale, unrealized losses (2)   (2)
Securities available-for-sale, unrealized gains 0   0
Securities available-for-sale, allowance for credit losses [1] (2)    
Securities available-for-sale, amortized cost 32    
Securities available-for-sale, amortized cost     34
Other securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, fair value 116   111
Securities available-for-sale, unrealized losses (3)   0
Securities available-for-sale, unrealized gains 3   3
Securities available-for-sale, allowance for credit losses [1] 0    
Securities available-for-sale, amortized cost 116    
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] 4,231   3,286
Securities available-for-sale, unrealized losses [3] (7)   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] $ 4,232    
Securities available-for-sale, amortized cost [3]     $ 3,282
[1] As discussed in Note 21, "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 4, "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.