Capital Contributions, Dividends and Statutory Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividends Payable [Line Items]
Percentage threshold of dividends paid in previous twelve months to earned statutory surplus of prior year end, requiring approval of payment of dividends if exceeded	10.00%
Capital contribution from parent	$ 0	$ 0	$ 20
Statutory net income (loss)	577	549	$ 794
Statutory capital and surplus	2,000	1,800
Contribution of capital	0	0
Parent Company
Dividends Payable [Line Items]
Dividends paid to parent company	$ 310	48
Parent Company | CONNECTICUT
Dividends Payable [Line Items]
Dividends paid to parent company		$ 809