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Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale $ 31,329 $ 30,700
Available-for-sale securities, Unrealized Losses (1,013) (544)
Available-for-sale Securities, Unrealized Gains 188 263
Available-for-sale Securities, Amortized Cost 32,154 30,981
Securities held-to-maturity, fair value 14,445 13,902
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (483) (149)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 39 74
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 14,889 13,977
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 13,920 15,164
Available-for-sale securities, Unrealized Losses (472) (329)
Available-for-sale Securities, Unrealized Gains 127 153
Available-for-sale Securities, Amortized Cost 14,265 15,340
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 5,361 3,539
Available-for-sale securities, Unrealized Losses (243) (77)
Available-for-sale Securities, Unrealized Gains (1) 0
Available-for-sale Securities, Amortized Cost 5,605 3,616
Securities held-to-maturity, fair value 1,807 2,111
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (59) (12)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1 10
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,865 2,113
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 641 624
Available-for-sale securities, Unrealized Losses (47) (24)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 688 648
Securities held-to-maturity, fair value 1,936 1,304
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (42) (18)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 26 41
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,952 1,281
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 3,042 3,454
Available-for-sale securities, Unrealized Losses (3) 0
Available-for-sale Securities, Unrealized Gains 41 85
Available-for-sale Securities, Amortized Cost 3,004 3,369
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 4,351 5,066
Available-for-sale securities, Unrealized Losses (208) (87)
Available-for-sale Securities, Unrealized Gains 0 1
Available-for-sale Securities, Amortized Cost 4,559 5,152
Securities held-to-maturity, fair value 2,090 2,476
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (93) (13)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2 4
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 2,181 2,485
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 1,065 775
Available-for-sale securities, Unrealized Losses (37) (18)
Available-for-sale Securities, Unrealized Gains 0 1
Available-for-sale Securities, Amortized Cost 1,102 792
Securities held-to-maturity, fair value 8,599 7,995
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (289) (106)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 10 18
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 8,878 8,083
Direct Agency Obligations Issued By Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 349 438
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 14 19
Available-for-sale Securities, Amortized Cost 335 419
Obligations of U.S. states and political subdivision [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 11 13
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 1
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 11 12
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 2 3
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 3
Home Equity Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 44 51
Available-for-sale securities, Unrealized Losses (2) (3)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 46 54
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 105 510
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 6 4
Available-for-sale Securities, Amortized Cost 99 506
Foreign Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale [1] 2,451 902
Available-for-sale securities, Unrealized Losses [1] (1) 0
Available-for-sale Securities, Unrealized Gains [1] 1 0
Available-for-sale Securities, Amortized Cost [1] $ 2,451 902
Equity securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale   177
Available-for-sale securities, Unrealized Losses   (6)
Available-for-sale Securities, Unrealized Gains   0
Available-for-sale Securities, Amortized Cost   $ 183
[1] Foreign debt securities represent public sector entity, bank or corporate debt.