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.

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

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Amount of increase in allowance for credit loss on reinsurance recoverable, from recovery.

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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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reinsurance Receivable and Accounting Pronouncements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance allowance, allowance for credit loss	$ 94,168,000		$ 0
Reinsurance recoverable, write-offs	0
Reinsurance recoveries	0
Gross reinsurance receivables	4,600,000,000
Cumulative effect adjustment resulting in a decrease in retained earnings	$ (13,539,463,000)		(11,206,826,000)	$ (7,042,788,000)	$ (8,324,285,000)
Concentrated credit risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	10.00%
Concentrated credit risk \| AM Best Rating
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	71.00%
Concentrated credit risk \| A Plus
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	76.00%
Concentrated credit risk \| A
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	14.00%
Concentrated credit risk \| AM Best, A- Rating
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage	10.00%
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment resulting in a decrease in retained earnings	$ (1,737,907,000)		(1,533,645,000)	(1,031,465,000)	(916,971,000)
Cumulative effect adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reinsurance allowance, allowance for credit loss		$ 96,000,000.0
Cumulative effect adjustment resulting in a decrease in retained earnings			138,100,000	50,804,000	89,985,000
Cumulative effect adjustments \| Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment resulting in a decrease in retained earnings		$ 138,100,000	$ 138,100,000	$ 50,804,000	$ 79,433,000