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Available-for-Sale and Held-to-Maturity Securities (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investment Holdings    
FHLB, restricted stock holdings $ 497 $ 497
Federal Reserve Bank, restricted stock holdings 347 347
Available-for-sale and other securities 15,263 [1] 15,207 [1]
Interest-Only-Strip
   
Investment Holdings    
Available-for-sale and other securities $ 456 $ 408
[1] Amortized cost of $14,652 and $14,571 at March 31, 2013 and December 31, 2012, respectively.