Business, Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ in Millions		3 Months Ended	9 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2020 segment	Sep. 30, 2019 USD ($)
Schedule of Equity Transactions [Line Items]
Impact to previously reported net income | $				$ 47
Number of Operating Segments | segment			1
Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description		—	(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]
New Accounting Pronouncement or Change in Accounting Principle, Description	12
Deferred Policy Acquisition Cost | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	2
Deferred Income Tax | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	2
Retained Earnings (Deficit) | Accounting Standards Update 2016-13
Schedule of Equity Transactions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	8	—	(8)