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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) $ (16) $ (7) $ (20)
Associated amortization of DAC, VOBA, DSI and DFEL 1   2
Net OTTI recognized in net income (loss) (15) (7) (18)
OTTI Recognized in OCI      
Gross OTTI recognized in OCI 16    
Change in DAC, VOBA, DSI and DFEL (1)    
Net 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) (14) (5) (13)
Fixed Maturity AFS Securities [Member] | ABS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) (1) (1) (2)
Fixed Maturity AFS Securities [Member] | RMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss) $ (1) $ (1) (2)
Fixed Maturity AFS Securities [Member] | CMBS [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss)     (2)
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]      
OTTI Recognized in Net Income (Loss)      
Gross OTTI recognized in net income (loss)     $ (1)