- Reinsurance (Details) $ in Millions	Oct. 02, 1998 USD ($)	Dec. 31, 2019 USD ($) affiliate reinsurer	Dec. 31, 2018 USD ($)
Effects of Reinsurance [Line Items]
Reinsurance treaties, number of affiliates | affiliate		1
Premiums receivable and reinsurance recoverable		$ 1,304	$ 1,409
Security Life of Denver International Limited and Langhorne I, LLC
Effects of Reinsurance [Line Items]
Reinsurance treaties, number of affiliates | affiliate		1
Unaffiliated Reinsurers
Effects of Reinsurance [Line Items]
Number of outstanding reinsurance agreements | reinsurer		6
Lincoln National Corporation, Subsidiary
Effects of Reinsurance [Line Items]
Proceeds from disposal of life insurance business	$ 1,000
Premiums receivable and reinsurance recoverable		$ 1,300	$ 1,400