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Available-for-Sale and Held-to-Maturity Securities (Parenthetical) (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Investment Holdings [Line Items]    
FHLB, restricted stock holdings $ 248 $ 248
Federal Reserve Bank, restricted stock holdings 355 355
Available-for-sale and other securities [1] 29,891 29,044
DTCC, restricted stock holdings 1 1
Interest-Only Mortgage-Backed Securities    
Investment Holdings [Line Items]    
Available-for-sale and other securities $ 41 $ 50
[1] Amortized cost of $28,838 and $28,678 at March 31, 2016 and December 31, 2015, respectively.