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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value $ 35,663 $ 31,379
Securities available-for-sale, unrealized losses (330) (758)
Securities available-for-sale, unrealized gains 261 177
Securities available-for-sale, amortized cost 35,732 31,960
Securities held-to-maturity, fair value 13,431 14,443
Securities held-to-maturity, unrealized losses (27) (299)
Securities held-to-maturity, unrealized gain 165 72
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 13,293 14,670
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 16,078 13,290
Securities available-for-sale, unrealized losses (269) (365)
Securities available-for-sale, unrealized gains 128 106
Securities available-for-sale, amortized cost 16,219 13,549
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 3,402 5,393
Securities available-for-sale, unrealized losses (13) (154)
Securities available-for-sale, unrealized gains 57 6
Securities available-for-sale, amortized cost 3,358 5,541
Securities held-to-maturity, fair value 1,653 1,779
Securities held-to-maturity, unrealized losses (1) (34)
Securities held-to-maturity, unrealized gain 22 1
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 1,632 1,812
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 347 652
Securities available-for-sale, unrealized losses (1) (35)
Securities available-for-sale, unrealized gains 3 1
Securities available-for-sale, amortized cost 345 686
Securities held-to-maturity, fair value 1,454 1,886
Securities held-to-maturity, unrealized losses (4) (26)
Securities held-to-maturity, unrealized gain 40 34
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 1,418 1,878
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 1,403 2,866
Securities available-for-sale, unrealized losses 0 (2)
Securities available-for-sale, unrealized gains 21 37
Securities available-for-sale, amortized cost 1,382 2,831
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 9,997 4,272
Securities available-for-sale, unrealized losses (41) (171)
Securities available-for-sale, unrealized gains 29 1
Securities available-for-sale, amortized cost 10,009 4,442
Securities held-to-maturity, fair value 3,021 2,043
Securities held-to-maturity, unrealized losses 0 (63)
Securities held-to-maturity, unrealized gain 17 2
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 3,004 2,104
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 747 1,120
Securities available-for-sale, unrealized losses (4) (29)
Securities available-for-sale, unrealized gains 10 9
Securities available-for-sale, amortized cost 741 1,140
Securities held-to-maturity, fair value 7,290 8,722
Securities held-to-maturity, unrealized losses (22) (176)
Securities held-to-maturity, unrealized gain 85 35
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 7,227 8,863
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 260 304
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, unrealized gains 6 9
Securities available-for-sale, amortized cost 254 295
Obligations of U.S. states and political subdivision [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 0
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 10 11
Residential Mortgage 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 0 0
Securities held-to-maturity, amortized cost, before Other-than-temporary Impairment 2 2
Home Equity Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 32 42
Securities available-for-sale, unrealized losses (2) (2)
Securities available-for-sale, unrealized gains 0 0
Securities available-for-sale, amortized cost 34 44
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value 111 107
Securities available-for-sale, unrealized losses 0 0
Securities available-for-sale, unrealized gains 3 5
Securities available-for-sale, amortized cost 108 102
Foreign debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, fair value [1] 3,286 3,333
Securities available-for-sale, unrealized losses [1] 0 0
Securities available-for-sale, unrealized gains [1] 4 3
Securities available-for-sale, amortized cost [1] $ 3,282 $ 3,330
[1] Foreign debt securities represent public sector entity, bank or corporate debt.