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Closed Block (Policyholder Dividend Obligation) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Closed block policyholder dividend obligation    
Balance beginning of period $ 3,828 $ 2,919
Change in unrealized investment and derivative gains (losses) (1,555) 909
Balance end of period $ 2,273 $ 3,828