SCHEDULE II — CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT - CONDENSED BALANCE SHEET (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	$ 16,304	$ 13,699
Common shares, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	3,000	3,000
Common stock, shares issued	1,000	1,000
Common shares, outstanding (in shares)	1,000	1,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit)	$ (76)	$ (225)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Amortized Cost	$ 0	$ 0
Common shares, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	3,000	3,000
Common stock, shares issued	1,000	1,000
Common shares, outstanding (in shares)	1,000	1,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit)	$ (76)	$ (225)