INVESTMENTS - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Non-accrual status	$ 1,000,000		$ 2,000,000
Decrease in collateral securities held	46,000,000	$ 11,000,000
Liabilities associated with secured borrowing arrangements	1,123,000,000		967,000,000
Ceded Business
Debt Securities, Available-for-Sale [Line Items]
Liabilities associated with secured borrowing arrangements	2,000,000		0
U.S. corporate public securities
Debt Securities, Available-for-Sale [Line Items]
Securities	1,121,000,000		967,000,000
U.S. corporate public securities | Ceded Business
Debt Securities, Available-for-Sale [Line Items]
Liabilities associated with secured borrowing arrangements	2,000,000
U.S. corporate public securities | Fair Value
Debt Securities, Available-for-Sale [Line Items]
Securities	$ 1,149,000,000		$ 999,000,000