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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Taxes          
Effective tax rate (as a percent) 14.00% 33.00% 16.00% 23.00%  
Amount of correction of tax related to securities lending activities in 2012     $ 32    
Maximum period for recognizing capital losses     5 years    
Valuation Allowance 5   5   5
Gross unrecognized tax benefits 77   77   65
Unrecognized tax benefits, net of federal tax benefits that would affect the effective tax rate if recognized 20   20   8
Estimated decrease in amount of unrecognized tax benefits in next 12 months 75   75    
Net increase (decrease) in interest and penalties 1 1 3 (4)  
Payable (receivable) related to accrued interest and penalties $ 33   $ 33   $ 30