REINSURANCE - Ceded Reinsurance (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Estimated net fair values of purchased market risk benefits	$ 5,415	$ 7,376
Third-party reinsurance recoverables related to insurance contracts	20,025	7,899	$ 8,068
Amount due to reinsurers	1,451	1,421
Top reinsurers	1,451	1,421	$ 1,426
Ceded group health reserves
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables related to insurance contracts	56	53
Reinsurance assumed reserves	630	647
MRB
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Increase (decrease) estimated net fair values of purchased market risk benefits	(2,000)	(2,100)
First Allmerica-GAF
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables related to insurance contracts	3,087	3,245
Top reinsurers	76	77
Zurich Life Insurance Company, Ltd.
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables related to insurance contracts	1,157	2,444
RGA Reinsurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Reinsurance recoverables related to insurance contracts	1,920	1,205
Top reinsurers	1,159	2,187
Protective Life Insurance Company
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Top reinsurers	$ 95	$ 106

Reinsurance, Due From Reinsurer, Fair Value Disclosure

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Reinsurance Recoverable, Amount Due To Reinsurers

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Liability as of the balance sheet date for the estimated ultimate cost of settling claims and claim adjustment expense relating to insured events that have occurred on or before the balance sheet date for those liabilities owed to another party as a result of assuming another insurer's primary obligation.

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The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to and paid by the ceding insurer.

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