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Segment Information (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
division
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting [Abstract]        
Number of divisions | division   4    
Number of Reportable Segments | segment   7    
Segment Reporting Information [Line Items]        
Total deferred gain (loss)   $ 182    
Synthetic Gic Fees   158 $ 168 $ 157
Realized investment gains (losses), net, and related adjustments        
Segment Reporting Information [Line Items]        
Derivative, Gain (Loss) on Derivative, Net, Terminated Or Offset Before Maturity   55 105 72
Gain (Loss) From Derivative Counterparty Exposure Adjustments   0 19 146
Gain (Loss) From Non-Performance Risk Adjustments   8 (1) $ 30
Group Insurance        
Segment Reporting Information [Line Items]        
Out of Period Adjustment Increase/Benefit (Decrease/Charge)     (84)  
International Insurance        
Segment Reporting Information [Line Items]        
Out of Period Adjustment Increase/Benefit (Decrease/Charge)     (73)  
Included In Operating Measure        
Segment Reporting Information [Line Items]        
Out of Period Adjustment Increase/Benefit (Decrease/Charge)     (193)  
Income From Continuing Operations Before Income Taxes And Equity In Earnings Of Operating Joint Ventures        
Segment Reporting Information [Line Items]        
Out of Period Adjustment Increase/Benefit (Decrease/Charge) $ (156) $ 84 $ (193)