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Securities (Available-for-Sale and Held-to-Maturity Securities) (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Investment Holdings    
FHLB, restricted stock holdings $ 248 $ 248
FRB, restricted stock holdings 357 355
Available-for-sale and other securities [1] 30,689 29,044
DTCC, restricted stock holdings 1 1
Interest-Only Mortgage-Backed Securities    
Investment Holdings    
Available-for-sale and other securities $ 33 $ 50
[1] Amortized cost of $ 29,486 and $ 28,678 at September 30, 2016 and Dec ember 31, 2015 , respectively.