Reinsurance Reinsurance Recoverable (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	$ 16,950	$ 16,737
Reinsurance recoverables net of loss allowance	11	12
Deposit assets	10,796	10,574
Somerset Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance payable	1,974	1,518
Deposit assets	2,152	1,619
Prismic Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Deposit assets	3,660	3,771
Individual and group annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	7,095	7,516
Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	9,470	8,806
Life insurance | Somerset Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables net of loss allowance	716
Other reinsurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	385	415
Hartford Life Business
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance payable	1,372	1,396
Hartford Life Business | Life insurance
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	2,013	2,090
Prismic Re
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance payable	7,775	8,543
Prismic Re | Individual and group annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	5,604	5,981
FLIAC | Individual and group annuities
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Total reinsurance recoverables	$ 1,452	$ 1,485