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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities $ 32,040 $ 31,379
Available-for-sale securities, Unrealized Losses (549) (758)
Available-for-sale Securities, Unrealized Gains 196 177
Available-for-sale Securities, Amortized Cost 32,393 31,960
Securities held-to-maturity, fair value 14,299 14,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (173) (299)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 89 72
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 14,383 14,670
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 13,658 13,290
Available-for-sale securities, Unrealized Losses (312) (365)
Available-for-sale Securities, Unrealized Gains 103 106
Available-for-sale Securities, Amortized Cost 13,867 13,549
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 5,270 5,393
Available-for-sale securities, Unrealized Losses (75) (154)
Available-for-sale Securities, Unrealized Gains 35 6
Available-for-sale Securities, Amortized Cost 5,310 5,541
Securities held-to-maturity, fair value 1,896 1,779
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15) (34)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 5 1
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,906 1,812
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 664 652
Available-for-sale securities, Unrealized Losses (21) (35)
Available-for-sale Securities, Unrealized Gains 1 1
Available-for-sale Securities, Amortized Cost 684 686
Securities held-to-maturity, fair value 1,832 1,886
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (16) (26)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 38 34
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,810 1,878
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 3,045 2,866
Available-for-sale securities, Unrealized Losses (2) (2)
Available-for-sale Securities, Unrealized Gains 31 37
Available-for-sale Securities, Amortized Cost 3,016 2,831
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 5,199 4,272
Available-for-sale securities, Unrealized Losses (113) (171)
Available-for-sale Securities, Unrealized Gains 3 1
Available-for-sale Securities, Amortized Cost 5,309 4,442
Securities held-to-maturity, fair value 2,085 2,043
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (31) (63)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2 2
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 2,114 2,104
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 987 1,120
Available-for-sale securities, Unrealized Losses (22) (29)
Available-for-sale Securities, Unrealized Gains 8 9
Available-for-sale Securities, Amortized Cost 1,001 1,140
Securities held-to-maturity, fair value 8,472 8,722
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (111) (176)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 43 35
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 8,540 8,863
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 272 304
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 6 9
Available-for-sale Securities, Amortized Cost 266 295
Obligations of U.S. states and political subdivision [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 12 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1 0
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 11 11
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 2 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt 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]    
Available-for-sale Securities 38 42
Available-for-sale securities, Unrealized Losses (4) (2)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 42 44
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 109 107
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 5 5
Available-for-sale Securities, Amortized Cost 104 102
Foreign Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities [1] 2,798 3,333
Available-for-sale securities, Unrealized Losses [1] 0 0
Available-for-sale Securities, Unrealized Gains [1] 4 3
Available-for-sale Securities, Amortized Cost [1] $ 2,794 $ 3,330
[1] Foreign debt securities represent public sector entity, bank or corporate debt.