Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (1)	$ (4)	$ (3)	$ (8)
Net OTTI recognized in net income (loss), pre-tax	(1)	(4)	(3)	(8)
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (1)	$ (4)	$ (3)	(5)
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)
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)				$ (1)