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Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) $ (15) $ (7) $ (20)
Associated amortization of DAC, VOBA, DSI and DFEL     2
Net OTTI recognized in net income (loss) (15) (7) (18)
OTTI Recognized in OCI      
Gross OTTI recognized in OCI 14    
Change in DAC, VOBA, DSI and DFEL (1)    
Net OTTI recognized in OCI 13    
Fixed Maturity Securities [Member] | Corporate Bonds [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (13) (5) (13)
Fixed Maturity Securities [Member] | State And Municipal Bonds [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss)     (1)
Fixed Maturity Securities [Member] | RMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (1) (1) (2)
Fixed Maturity Securities [Member] | CMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss)     (2)
Fixed Maturity Securities [Member] | ABS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) $ (1) $ (1) $ (2)