XML 31 R49.htm IDEA: XBRL DOCUMENT v3.19.3
Securities - Amortized Cost and Fair Value of Asset Backed Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities $ 41,416 $ 31,379
Available-for-sale securities, Unrealized Losses (318) (758)
Available-for-sale Securities, Unrealized Gains 359 177
Available-for-sale Securities, Amortized Cost 41,375 31,960
Securities held-to-maturity, fair value 13,502 14,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (26) (299)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 178 72
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 13,350 14,670
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 19,348 13,290
Available-for-sale securities, Unrealized Losses (259) (365)
Available-for-sale Securities, Unrealized Gains 181 106
Available-for-sale Securities, Amortized Cost 19,426 13,549
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 4,270 5,393
Available-for-sale securities, Unrealized Losses (10) (154)
Available-for-sale Securities, Unrealized Gains 93 6
Available-for-sale Securities, Amortized Cost 4,187 5,541
Securities held-to-maturity, fair value 1,736 1,779
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1) (34)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 22 1
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,715 1,812
Collateralized Mortgage Obligations, Issued by U.S. Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 686 652
Available-for-sale securities, Unrealized Losses (3) (35)
Available-for-sale Securities, Unrealized Gains 10 1
Available-for-sale Securities, Amortized Cost 679 686
Securities held-to-maturity, fair value 1,627 1,886
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4) (26)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 43 34
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 1,588 1,878
Direct Agency Obligations U S Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 2,629 2,866
Available-for-sale securities, Unrealized Losses 0 (2)
Available-for-sale Securities, Unrealized Gains 18 37
Available-for-sale Securities, Amortized Cost 2,611 2,831
Mortgage-backed Securities, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 9,963 4,272
Available-for-sale securities, Unrealized Losses (39) (171)
Available-for-sale Securities, Unrealized Gains 36 1
Available-for-sale Securities, Amortized Cost 9,966 4,442
Securities held-to-maturity, fair value 2,383 2,043
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 0 (63)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 21 2
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 2,362 2,104
Collateralized Mortgage Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 652 1,120
Available-for-sale securities, Unrealized Losses (2) (29)
Available-for-sale Securities, Unrealized Gains 11 9
Available-for-sale Securities, Amortized Cost 643 1,140
Securities held-to-maturity, fair value 7,743 8,722
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (21) (176)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 91 35
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 7,673 8,863
Direct Agency Obligations, Issued or Guaranteed by US Government Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 265 304
Available-for-sale securities, Unrealized Losses (1) 0
Available-for-sale Securities, Unrealized Gains 2 9
Available-for-sale Securities, Amortized Cost 264 295
Obligations of U.S. states and political subdivision [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities held-to-maturity, fair value 11 11
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 10 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 33 42
Available-for-sale securities, Unrealized Losses (3) (2)
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Amortized Cost 36 44
Other securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities 115 107
Available-for-sale securities, Unrealized Losses 0 0
Available-for-sale Securities, Unrealized Gains 5 5
Available-for-sale Securities, Amortized Cost 110 102
Foreign Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities [1] 3,455 3,333
Available-for-sale securities, Unrealized Losses [1] (1) 0
Available-for-sale Securities, Unrealized Gains [1] 3 3
Available-for-sale Securities, Amortized Cost [1] $ 3,453 $ 3,330
[1] Foreign debt securities represent public sector entity, bank or corporate debt.