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Securities (Investment Securities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Investment Holdings    
Available-for-sale debt securities, fair value [1] $ 31,808 $ 31,751
Available-for-sale debt securities, unrealized losses (942) (134)
Available-for-sale debt securities, unrealized gains 43 308
Available-for-sale debt securities, amortized cost 32,707 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 269 492
Equity securities, fair value 500 439
U.S. Treasury and federal agencies    
Investment Holdings    
Available-for-sale debt securities, fair value 95 98
Available-for-sale debt securities, unrealized losses (3) 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
Agency mortgage-backed securities | Residential mortgage backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value 15,973 15,319 [3]
Available-for-sale debt securities, unrealized losses (489) (80) [3]
Available-for-sale debt securities, unrealized gains 15 118
Available-for-sale debt securities, amortized cost 16,447 15,281
Agency mortgage-backed securities | Commercial mortgage backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value 10,046 10,167
Available-for-sale debt securities, unrealized losses (363) (38)
Available-for-sale debt securities, unrealized gains 4 92
Available-for-sale debt securities, amortized cost 10,405 10,113
Non-agency mortgage-backed securities | Commercial mortgage backed securities    
Investment Holdings    
Available-for-sale debt securities, fair value 3,097 3,293
Available-for-sale debt securities, unrealized losses (76) (5)
Available-for-sale debt securities, unrealized gains 4 51
Available-for-sale debt securities, amortized cost 3,169 3,247
Asset-backed securities and other debt securities    
Investment Holdings    
Available-for-sale debt securities, fair value 2,044 2,218
Available-for-sale debt securities, unrealized losses (11) (11)
Available-for-sale debt securities, unrealized gains 20 46
Available-for-sale debt securities, amortized cost 2,035 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 551 612
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 $ 551 $ 612
[1]
  • Amortized cost of $ 32,707 and $ 31,577 at September 30, 2018 and December 31, 2017 , respectively.
[2]

Fair value of $ 18 and $ 24 at September 30, 2018 and December 31, 2017 , respectively.

[3]

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