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Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Estimated future amortization expense allocated to other expenses for VOBA [Abstract]  
VOBA 2013 $ 1,048
VOBA 2014 909
VOBA 2015 763
VOBA 2016 667
VOBA 2017 574
Value of Distribution Agreements and Customer Relationships Acquired [Abstract]  
VODA and VOCRA 2013 77
VODA and VOCRA 2014 80
VODA and VOCRA 2015 81
VODA and VOCRA 2016 77
VODA and VOCRA 2017 73
Negative Value of Business Acquired [Abstract]  
Negative VOBA 2013 (521)
Negative VOBA 2014 (445)
Negative VOBA 2015 (364)
Negative VOBA 2016 (284)
Negative VOBA 2017 $ (166)