Investments (Changes In The Valuation Allowance Of Impaired Mortgage Loans On Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allowance for Losses
Balance as of end-of-period	$ 2		$ 2
Commercial [Member]
Allowance for Losses
Balance as of beginning-of-period		$ 3		$ 3
Additions
Charge-offs, net of recoveries		(1)		(1)
Balance as of end-of-period		$ 2		$ 2