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Investment Securities (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Residential Mortgage Backed Securities [Member]
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Jun. 30, 2011
Residential Mortgage Backed Securities [Member]
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment [Line Items]        
Investment securities $ 47,931 $ 47,374 $ 811 $ 1,626
OTTI previously recognized through OCI on securities held, gross unrealized losses $ (200)