Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal income taxes received from (paid to) Loews		$ 127,000,000	$ 142,000,000	$ 256,000,000
Unrecognized tax benefits	$ 0	0	0
Interest income (expense)		0	0	0
Income tax penalties expense		0	0	0
Accrued interest and penalties	0	0	0
Effective income tax rate reconciliation, change in enacted tax rate, amount		(83,000,000)
Net deferred tax asset remeasurement	(83,000,000)	(83,000,000)	0	0
Deferred tax liability on undistributed income related to a foreign subsidiary	2,000,000	2,000,000
Undistributed earnings from a foreign subsidiary	10,000,000	10,000,000
Foreign tax expense (benefit) on income from continuing operations		(1,000,000)	(9,000,000)	(14,000,000)
Income (loss) from continuing foreign operations		39,000,000	51,000,000	$ 71,000,000
Operating loss carryforwards	0	0
Valuation allowance	$ 0	$ 0	$ 0