Income Tax (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax Examination, Penalties Expense		$ 0	$ 0	$ 0
Income tax benefit related to the separate account dividends received deduction		$ 123,000	88,000	143,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		50.00%
Operating Loss Carryforwards		$ 2,000,000
Excess loss account - Separation from MetLife (1)		1,088,000	0	0
Rate revaluation due to tax reform (2)		(696,000)	0	0
Deferred Tax Assets, Operating Loss Carryforwards		416,000	0
Due from Related Parties		$ 857,000
Minimum
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2033
Maximum
True-up of the prior year tax return included in current year benefit related to the separate account dividends received deduction		$ 6,000	$ 22,000	$ 13,000
Operating Loss Carryforwards, Expiration Date		Jan. 01, 2037
Alternative Minimum Tax adjustment [Member]
Rate revaluation due to tax reform (2)		$ (696,000)
Metlife Inc [Member]
Related Party Transaction, Amounts of Transaction	$ 723,000