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Insurance Subsidiaries - Captive Reinsurance Subsidiaries (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Dividends, Common Stock, Cash	$ 6	$ 8	$ 8
Missouri
Statutory Accounting Practices [Line Items]
Prescribed practice amount	676	623
Aggregate statutory capital and surplus, including prescribed practices	156	398
Arizona \| Roaring River II, Inc
Statutory Accounting Practices [Line Items]
Permitted practice amount		2,761
Arizona \| Security Life of Denver International Ltd
Statutory Accounting Practices [Line Items]
Permitted practice amount	431	$ 451
Security Life of Denver International Ltd \| Subsidiaries \| Arizona
Statutory Accounting Practices [Line Items]
Dividends, Common Stock, Cash	425
Roaring River II, Inc \| Subsidiaries \| Arizona
Statutory Accounting Practices [Line Items]
Dividends, Common Stock, Cash	$ 270