Investments (OTTI Recognized In Net Income (Loss) And OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (7)	$ (20)	$ (102)
Associated amortization of DAC, VOBA, DSI and DFEL		2
Net OTTI recognized in net income (loss), pre-tax	(7)	(18)	(102)
Fixed Maturity AFS Securities [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	(7)	(20)	(101)
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	(5)	(13)	(80)
Fixed Maturity AFS Securities [Member] | ABS [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	(1)	(2)	(5)
Fixed Maturity AFS Securities [Member] | RMBS [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)	$ (1)	(2)	(11)
Fixed Maturity AFS Securities [Member] | CMBS [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)		(2)	(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)	(3)
Equity AFS Securities [Member]
OTTI Recognized in Net Income (Loss)
Gross OTTI recognized in net income (loss)			$ (1)