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Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss) $ (2) $ (4)
Net OTTI recognized in net income (loss), pre-tax (2) (4)
Portion of OTTI Recognized in OCI    
Gross OTTI recognized in OCI
Change in DAC, VOBA, DSI and DFEL
Net portion of OTTI recognized in OCI, pre-tax
Fixed maturity AFS securities [Member] | Corporate Bonds [Member]    
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss) $ (2) (2)
Fixed maturity AFS securities [Member] | ABS [Member]    
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss)   (1)
Fixed maturity AFS securities [Member] | RMBS [Member]    
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss)   $ (1)