INVESTMENTS - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Net Investment Income [Line Items]
Gross investment income	$ 91	$ 87
Less: investment expenses (1)	(21)	(11)
Net investment income	70	76
Retained Business
Net Investment Income [Line Items]
Gross investment income	77	65
Less: investment expenses (1)	(21)	(9)
Net investment income	56	56
Ceded Business
Net Investment Income [Line Items]
Gross investment income	14	22
Less: investment expenses (1)	0	(2)
Net investment income	14	20
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	72	61
Fixed maturity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income	60	47
Fixed maturity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	12	14
Equity securities
Net Investment Income [Line Items]
Gross investment income	0	1
Equity securities \| Retained Business
Net Investment Income [Line Items]
Gross investment income	0	0
Equity securities \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	0	1
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	8	4
Mortgage loans \| Retained Business
Net Investment Income [Line Items]
Gross investment income	8	4
Mortgage loans \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	0	0
Other invested assets
Net Investment Income [Line Items]
Gross investment income	1	13
Other invested assets \| Retained Business
Net Investment Income [Line Items]
Gross investment income	3	12
Other invested assets \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	(2)	1
Short-term investments and cash equivalents
Net Investment Income [Line Items]
Gross investment income	10	8
Short-term investments and cash equivalents \| Retained Business
Net Investment Income [Line Items]
Gross investment income	6	2
Short-term investments and cash equivalents \| Ceded Business
Net Investment Income [Line Items]
Gross investment income	4	$ 6
Repurchase agreements \| Retained Business
Net Investment Income [Line Items]
Less: investment expenses (1)	$ (15)

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Amount of expenses related to the generation of investment income.

+ References

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
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