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) |