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Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss) $ (8) $ (2)
Net OTTI recognized in net income (loss) (8) (2)
Portion of OTTI Recognized in OCI    
Gross OTTI recognized in OCI 16  
Change in DAC, VOBA, DSI and DFEL (1)  
Net portion of OTTI recognized in OCI 15
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]    
OTTI Recognized in Net Income (Loss)    
Gross OTTI recognized in net income (loss) (6) $ (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)