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Insurance Subsidiaries - Captive Reinsurance Subsidiaries (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory Accounting Practices [Line Items]
Dividends paid	$ 44	$ 6	$ 8
Missouri
Statutory Accounting Practices [Line Items]
Prescribed practice amount	749	676
Aggregate statutory capital and surplus, including prescribed practices	172	156
Arizona \| Security Life of Denver International Ltd
Statutory Accounting Practices [Line Items]
Permitted practice amount	440	$ 431
Security Life of Denver International Ltd \| Subsidiaries \| Arizona
Statutory Accounting Practices [Line Items]
Dividends paid	228
Roaring River II, Inc \| Subsidiaries \| Arizona
Statutory Accounting Practices [Line Items]
Dividends paid	$ 154