SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reinsurance Receivable and Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance liabilities	$ 2,300	$ 2,300
Reinsurance allowance, allowance for credit loss	92	94
Reinsurance recoverable, write-offs	0	$ 0
Gross reinsurance receivables	$ 4,500
Concentrated credit risk \| Ceded Credit Risk, Secured \| Reinsurance Recoverable Including Reinsurance Premium Paid
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	11.00%
Concentrated credit risk \| AM Best Rating \| Ceded Credit Risk, Secured \| Reinsurance Recoverable Including Reinsurance Premium Paid
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	84.00%
Concentrated credit risk \| A Plus \| Ceded Credit Risk, Secured \| Reinsurance Recoverable Including Reinsurance Premium Paid
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	54.00%
Concentrated credit risk \| A \| Ceded Credit Risk, Secured \| Reinsurance Recoverable Including Reinsurance Premium Paid
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	16.00%
Concentrated credit risk \| AM Best, A- Rating \| Ceded Credit Risk, Secured \| Reinsurance Recoverable Including Reinsurance Premium Paid
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	30.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

Amount of the write-down or write-off of a receivable from a reinsurer.

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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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- Definition

Amount of allowance for credit loss on reinsurance recoverable.

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Amount before valuation allowance recoverable 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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