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Investment Income and Gains and Losses - Realized Investment Gains and Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Realized Gains (Losses) on Investments [Line Items]        
Realized investment gains (losses) before income taxes $ 21 $ 65 $ 94 $ 107
Less income taxes (benefits) 8 22 33 37
Net realized investment gains (losses) 13 43 61 70
Impairments Table Details [Abstract]        
Credit-related [1] (6) (9) (12) (15)
Other (9) (1) (14) (1)
Total (15) (10) (26) (16)
Sales Information For Available For Sale Fixed Maturities Equity Securities [Abstract]        
Proceeds from sales 784 316 1,177 510
Gross gains on sales 24 3 51 25
Gross losses on sales 2 1 4 1
Fixed Maturities [Member]        
Realized Gains (Losses) on Investments [Line Items]        
Realized investment gains (losses) before income taxes 12 4 19 12
Equity securities [Member]        
Realized Gains (Losses) on Investments [Line Items]        
Realized investment gains (losses) before income taxes 1 0 14 17
Commercial Mortgage Loans [Member]        
Realized Gains (Losses) on Investments [Line Items]        
Realized investment gains (losses) before income taxes (3) (4) 2 (4)
Other Investments Including Derivatives [Member]        
Realized Gains (Losses) on Investments [Line Items]        
Realized investment gains (losses) before income taxes $ 11 $ 65 $ 59 $ 82
[1] Credit-related losses include other-than-temporary declines in the fair values of fixed maturities, increases in valuation reserves on commercial mortgage loans and asset write-downs related to investments in real estate entities.