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REINSURANCE - Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest $ 30,833,596 $ 28,038,902
Credit enhancements 22,739,417 23,490,354
Credit loss allowance 41,200 8,400
Affiliated Entity    
Ceded Credit Risk [Line Items]    
Net reinsurance credit exposure 8,094,400 5,173,730
A++    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 62,674 7,911
Credit enhancements 0 0
Net reinsurance credit exposure 62,674 7,911
A+    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 1,849,918 1,989,426
Credit enhancements 0 0
Net reinsurance credit exposure 1,849,918 1,989,426
A    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 2,491,461 2,652,286
Credit enhancements 0 0
Net reinsurance credit exposure 2,491,461 2,652,286
A-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 5,397,767 5,645,633
Credit enhancements 4,197,739 5,166,559
Net reinsurance credit exposure 1,200,028 479,074
B++    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 37,939 33,410
Credit enhancements 0 0
Net reinsurance credit exposure 37,939 33,410
B+    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 0 1,122
Credit enhancements 0 0
Net reinsurance credit exposure 0 1,122
B    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 0 9,227
Credit enhancements 0 0
Net reinsurance credit exposure 0 9,227
B-    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest (221) 1,274
Credit enhancements 0 0
Net reinsurance credit exposure 0 1,274
Not rated or private rating    
Ceded Credit Risk [Line Items]    
Reinsurance recoverable and funds withheld receivable at interest 20,994,058 17,698,613
Credit enhancements 18,541,678 18,323,795
Net reinsurance credit exposure 2,452,380 0
Not rated or private rating | Affiliated Entity    
Ceded Credit Risk [Line Items]    
Net reinsurance credit exposure $ 21,000,000 $ 17,700,000