Reinsurance - Reinsurance Recoverables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	$ 3,055	$ 4,131
Hartford Life and Accident Insurance Company
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	2,364	3,085
Lincoln Life & Annuity Company of New York
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	406	413
WellCare Health Plans
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	13	355
VOYA Retirement Insurance and Annuity Company
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	170	175
All Other
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	$ 102	$ 103