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Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) $ (20) $ (102) $ (60)
Associated amortization of DAC, VOBA, DSI and DFEL 2   6
Net OTTI recognized in net income (loss), pre-tax (18) (102) (54)
Portion of OTTI Recognized in OCI      
Gross OTTI recognized in OCI   55 30
Change in DAC, VOBA, DSI and DFEL   (12) (4)
Net portion of OTTI recognized in OCI, pre-tax   43 26
Equity AFS securities [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss)   (1)  
Fixed maturity securities [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (20) (101) (60)
Fixed maturity securities [Member] | Corporate Bonds [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (13) (80) (45)
Fixed maturity securities [Member] | ABS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (2) (5) (7)
Fixed maturity securities [Member] | RMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (2) (11) (7)
Fixed maturity securities [Member] | CMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (2) (2) $ (1)
Fixed maturity securities [Member] | State and municipal bonds [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) $ (1) $ (3)