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Basis of Presentation and Accounting Policies (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Reconciliation of the tax provision at the U.S. Federal statutory rate to the provision for income taxes        
Tax expense at the U.S. federal statutory rate $ 34 $ 91 $ 159 $ 193
Dividends-received deduction (29) (88) (61) (125)
Foreign related investments (3) (5) (6) (10)
Valuation allowance 6 (58) (13) (60)
Other 3 1 (1) 0
Income tax expense (benefit) $ 11 $ (59) $ 78 $ (2)