INVESTMENTS - Narrative (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022	Mar. 31, 2022
U.S. corporate public securities
Debt Securities, Available-for-Sale [Line Items]
Securities	$ 403,000,000	$ 311,000,000
U.S. corporate public securities | Fair Value
Debt Securities, Available-for-Sale [Line Items]
Securities	423,000,000	326,000,000
Equity securities
Debt Securities, Available-for-Sale [Line Items]
Securities	0	106,000,000
Equity securities | Fair Value
Debt Securities, Available-for-Sale [Line Items]
Securities	0	103,000,000
Mortgage and other loans
Debt Securities, Available-for-Sale [Line Items]
Non-accrual status	$ 3,000,000	$ 0
Commercial mortgage and other loans, allowance for credit losses			$ 1,000,000