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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 24 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2006
Income Taxes (Textual) [Abstract]          
Non-deductible losses related to managed investment entities $ 18 $ 20 $ 46 $ 55  
Decrease in the liability for unrecognized tax benefits 36   36    
Decrease in related accrued interest 16   16    
Cash payments for income taxes         $ 17