Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (2)	$ (9)	$ (5)	$ (17)
Associated amortization of DAC, VOBA, DSI and DFEL		1		1
Net OTTI recognized in net income (loss), pre-tax	(2)	(8)	(5)	(16)
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (2)	(8)	(4)	(13)
Fixed Maturity AFS Securities [Member] | ABS [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)		$ (1)		(2)
Fixed Maturity AFS Securities [Member] | RMBS [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)			$ (1)	(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)