Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended			24 Months Ended
	Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory federal income tax rate		21.00%	35.00%
Effective tax rate		(91.10%)	(91.50%)	(20.30%)
Tax benefit from the reduction in net deferred tax liabilities	$ 5	$ 1	$ 20		$ 21
DRD constituting non-taxable investment income		47	155	$ 142
Non-taxable investment income		$ 50	157	146
Percent of income tax expense (benefit)		5.00%
Income (loss) from domestic operations		$ 58	$ 170	$ 321