Reinsurance - Reinsurance Recoverables (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	$ 4,131	$ 4,541
Hartford Life and Accident Insurance Company
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	3,085	3,470
Lincoln Life & Annuity Company of New York
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	413	424
WellCare Health Plans
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	355	0
VOYA Retirement Insurance and Annuity Company
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	175	186
All Other
Ceded Credit Risk [Line Items]
Total reinsurance recoverables	$ 103	$ 461