Business, Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)
Schedule of Equity Transactions [Line Items]
Impact to previously reported net income		$ 20
Number of Operating Segments | segment	1
Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 8
Discontinued Operations, Held-for-sale | Directed Services LLC (DSL)
Schedule of Equity Transactions [Line Items]
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal	9.99%
Mortgage loans on real estate | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 12
Deferred Policy Acquisition Cost | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			2
Deferred Income Tax | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			2
Retained Earnings (Deficit) | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 8		$ 8