v3.8.0.1
Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
segment
division
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]      
Number of divisions | division 5    
Number of Reportable Segments | segment 7    
Total deferred gain (loss) $ 80    
Synthetic Gic Fees 159 $ 158 $ 158
Asset management and service fees 4,127 3,752 3,772
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Derivative, Gain (Loss) on Derivative, Net, Terminated Or Offset Before Maturity 53 49 $ 55
Individual Life      
Segment Reporting Information [Line Items]      
Out of period decrease adjustments   (153)  
Included In Operating Measure      
Segment Reporting Information [Line Items]      
Out of period decrease adjustments   $ (114)  
Domestic subsidiaries      
Segment Reporting Information [Line Items]      
Asset management and service fees 56    
Foreign subsidiaries      
Segment Reporting Information [Line Items]      
Asset management and service fees $ 19