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Securities (Investment Securities) (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Investment Holdings    
FHLB, restricted stock holdings $ 184 $ 248
FRB, restricted stock holdings 365 362
Available-for-sale debt and other securities [1] 31,808 31,751
DTCC, restricted stock holdings $ 2 2
Interest-Only Mortgage-Backed Securities    
Investment Holdings    
Available-for-sale debt and other securities   $ 34
[1]
  • Amortized cost of $ 32,707 and $ 31,577 at September 30, 2018 and December 31, 2017 , respectively.