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Investments (Net change in unrealized gains (losses) on investments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net change in unrealized gains (losses) on investments $ (2,556) $ 1,875 $ 1,437
Fixed maturity securities [Member]
     
Net change in unrealized gains (losses) on investments (2,541) 1,871 1,442
Equity securities [Member]
     
Net change in unrealized gains (losses) on investments (15) 5 (2)
Other [Member]
     
Net change in unrealized gains (losses) on investments    $ (1) $ (3)