v3.26.1
DERIVATIVE INSTRUMENTS - Schedule of Location and Amount of the Gain (Loss) Recognized (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives $ 119,240 $ 206,304 $ 60,742 $ 355,759
Derivative instruments not designated as hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 119,928 209,316 62,972 359,136
Derivative instruments not designated as hedges | Income Statement Location [Axis]: us-gaap:ForeignCurrencyTransactionGainLossBeforeTax        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (8,315) 33,885 (19,413) 42,059
Derivative instruments not designated as hedges | Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 128,243 175,431 82,385 317,077
Derivative instruments not designated as hedges | Fixed Maturity Investment-Related Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 4,179 54,931 (26,645) 131,533
Derivative instruments not designated as hedges | Interest rate futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 3,375 37,692 (37,836) 103,895
Derivative instruments not designated as hedges | Credit default swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 738 17,239 11,174 27,638
Derivative instruments not designated as hedges | Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 66 0 17 0
Derivative instruments not designated as hedges | Equity Investment-Related Derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 203,195 87,247 122,851 34,700
Derivative instruments not designated as hedges | Equity futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 203,195 87,247 122,851 34,700
Derivative instruments not designated as hedges | Commodity        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (79,131) 33,253 (13,821) 150,844
Derivative instruments not designated as hedges | Commodity futures        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (79,131) 35,372 (13,821) 153,446
Derivative instruments not designated as hedges | Commodity options        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives 0 (2,119) 0 (2,602)
Derivative instruments not designated as hedges | Foreign currency forward contracts, underwriting and non-investment operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (6,958) 35,673 (20,804) 44,934
Derivative instruments not designated as hedges | Foreign currency forward contracts, investment operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized on derivatives (1,357) (1,788) 1,391 (2,875)
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Accumulated other comprehensive income (loss) $ (688) $ (3,012) $ (2,230) $ (3,377)