XML 61 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1
Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale $ 31,028 $ 30,700
Available-for-sale securities, Unrealized Losses (868) (544)
Available-for-sale Securities, Unrealized Gains 226 263
Available-for-sale Securities, Amortized Cost 31,670 30,981
Securities held-to-maturity, fair value 14,805 13,902
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (396) (149)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 49 74
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 15,152 13,977
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 13,760 15,164
Available-for-sale securities, Unrealized Losses (407) (329)
Available-for-sale Securities, Unrealized Gains 148 153
Available-for-sale Securities, Amortized Cost 14,019 15,340
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 5,082 3,539
Available-for-sale securities, Unrealized Losses (196) (77)
Available-for-sale Securities, Unrealized Gains 4 0
Available-for-sale Securities, Amortized Cost 5,274 3,616
Securities held-to-maturity, fair value 1,898 2,111
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (47) (12)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1 10
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,944 2,113
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 579 624
Available-for-sale securities, Unrealized Losses (42) (24)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 621 648
Securities held-to-maturity, fair value 1,768 1,304
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (35) (18)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 31 41
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,772 1,281
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 3,038 3,454
Available-for-sale securities, Unrealized Losses (3) 0
Available-for-sale Securities, Unrealized Gains 51 85
Available-for-sale Securities, Amortized Cost 2,990 3,369
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 4,927 5,066
Available-for-sale securities, Unrealized Losses (186) (87)
Available-for-sale Securities, Unrealized Gains 1 1
Available-for-sale Securities, Amortized Cost 5,112 5,152
Securities held-to-maturity, fair value 2,213 2,476
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (75) (13)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 2 4
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 2,286 2,485
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 743 775
Available-for-sale securities, Unrealized Losses (32) (18)
Available-for-sale Securities, Unrealized Gains 0 1
Available-for-sale Securities, Amortized Cost 775 792
Securities held-to-maturity, fair value 8,911 7,995
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (239) (106)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 14 18
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 9,136 8,083
Direct Agency Obligations Issued By Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 356 438
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 15 19
Available-for-sale Securities, Amortized Cost 341 419
Obligations of U.S. states and political subdivision [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 13 13
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 1 1
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 12 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 47 51
Available-for-sale securities, Unrealized Losses (2) (3)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 49 54
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale 107 510
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 6 4
Available-for-sale Securities, Amortized Cost 101 506
Foreign Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale [1] 2,389 902
Available-for-sale securities, Unrealized Losses [1] 0 0
Available-for-sale Securities, Unrealized Gains [1] 1 0
Available-for-sale Securities, Amortized Cost [1] $ 2,388 902
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.