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Guarantee Arrangements and Pledged Assets (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Trend in repurchase demands received on loans sold to GSEs and other third parties by loan origination vintage        
Pre - 2004 $ 2 $ 2 $ 3 $ 3
2004 7 4 11 9
2005 9 6 14 14
2006 29 10 45 23
2007 76 31 120 70
2008 52 30 78 58
Post 2008 6 22 10 46
Total repurchase demands received $ 181 $ 105 $ 281 $ 223