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Investment Securities (Investment Securities) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Investment Holdings    
Available-for-sale debt securities, fair value [1] $ 32,830 $ 31,751
Available-for-sale debt securities, unrealized losses (464) (134)
Available-for-sale debt securities, unrealized gains 166 308
Available-for-sale debt securities, Amortized Cost 33,128 31,577
Held-to-maturity securities, fair value 18 24
Held-to-maturity, unrealized losses 0 0
Held-to-maturity, unrealized gains 0 0
Held-to-maturity securities, amortized cost [2] 18 24
Trading debt securities, fair value 287 492
Equity securities, fair value 452 439
U.S. Treasury and federal agencies    
Investment Holdings    
Available-for-sale debt securities, fair value 97 98
Available-for-sale debt securities, unrealized losses (1) 0
Available-for-sale debt securities, unrealized gains 0 0
Available-for-sale debt securities, Amortized Cost 98 98
Obligations of states and political subdivisions    
Investment Holdings    
Available-for-sale debt securities, fair value 2 44
Available-for-sale debt securities, unrealized losses 0 0
Available-for-sale debt securities, unrealized gains 0 1
Available-for-sale debt securities, Amortized Cost 2 43
Held-to-maturity securities, fair value 16 22
Held-to-maturity, unrealized losses 0 0
Held-to-maturity, unrealized gains 0 0
Held-to-maturity securities, amortized cost 16 22
Asset-backed securities and other debt securities    
Investment Holdings    
Available-for-sale debt securities, fair value 2,015 2,218
Available-for-sale debt securities, unrealized losses (10) (11)
Available-for-sale debt securities, unrealized gains 27 46
Available-for-sale debt securities, Amortized Cost 1,998 2,183
Held-to-maturity securities, fair value 2 2
Held-to-maturity, unrealized losses 0 0
Held-to-maturity, unrealized gains 0 0
Held-to-maturity securities, amortized cost 2 2
Other securities    
Investment Holdings    
Available-for-sale debt securities, fair value [3] 552 612
Available-for-sale debt securities, unrealized losses 0 0
Available-for-sale debt securities, unrealized gains 0 0
Available-for-sale debt securities, Amortized Cost 552 612
Residential mortgage backed securities | Agency mortgage-backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value [4] 16,247 15,319
Available-for-sale debt securities, unrealized losses (242) (80)
Available-for-sale debt securities, unrealized gains 86 118
Available-for-sale debt securities, Amortized Cost 16,403 15,281
Commercial mortgage-backed securities | Agency mortgage-backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value 10,650 10,167
Available-for-sale debt securities, unrealized losses (164) (38)
Available-for-sale debt securities, unrealized gains 44 92
Available-for-sale debt securities, Amortized Cost 10,770 10,113
Commercial mortgage-backed securities | Non-agency mortgage-backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value 3,267 3,293
Available-for-sale debt securities, unrealized losses (47) (5)
Available-for-sale debt securities, unrealized gains 9 51
Available-for-sale debt securities, Amortized Cost $ 3,305 $ 3,247
[1]

Amortized cost of $ 33,128 and $ 31,577 at December 31, 2018 and 2017 , respectively.

[2]

Fair value of $ 18 and $ 24 at December 31, 2018 and 2017 , respectively .

[3]

Other securities consist of FHLB, FRB and DTCC restricted stock holdings of $ 184 , $ 366 and $ 2 , respectively, at December 31, 2018 and $ 248 , $ 362 and $ 2 , respectively, at Dece mber 31, 2017 , that are carried at cost .

[4]

Includes interest-only mortgage-backed securities of $ 0 and $ 34 as of December 31, 2018 and 2017 , respectively, recorded at fair value with fair value changes recorded in securities (losses) gains, net , i n the Consolidated Statements of Income .