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STATUTORY FINANCIAL INFORMATION (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
board_member
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Statutory Financial Information [Line Items]      
Statutory net income $ (94,000,000) $ 598,000,000 $ 457,000,000
Bermuda      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 1,800,064,000 1,835,279,000  
Available statutory capital and surplus 3,641,279,000 4,055,252,000  
Minimum solvency margin amount $ 100,000,000    
Minimum solvency margin percentage of net written premiums 50.00%    
Minimum solvency margin percentage of net reserves 15.00%    
Minimum solvency margin percentage of ECR 25.00%    
Limit - prior year's total statutory capital surplus (Bermuda) 25.00%    
Number of directors required to sign affidavits in order to pay dividend/distribution greater than 25% of prior year statutory capital and surplus | board_member 2    
Maximum dividend/distribution payable without regulatory approval $ 900,000,000 1,000,000,000  
Ireland      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 613,923,000 552,678,000  
Available statutory capital and surplus 906,512,000 925,164,000  
Maximum dividend/distribution payable with regulatory approval 52,000,000 372,000,000  
U.S.      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 488,560,000 430,145,000  
Available statutory capital and surplus 1,511,480,000 1,470,772,000  
Maximum dividend/distribution payable without regulatory approval $ 115,000,000 147,000,000  
Maximum dividend limit - percentage of total statutory capital and surplus 10.00%    
AXIS Syndicate 1686      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, at fair value $ 557,000,000 293,000,000  
Financial instruments, as collateral, released from restriction 1,600,000    
AXIS Syndicate 1686 | Equity securities      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, at fair value 0 83,000,000  
AXIS Syndicate 1686 | Cash      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, at fair value 12,000,000 $ 7,000,000  
Novae Syndicate 2007      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, released from restriction 41,000,000    
Novae Syndicate 2007 | Equity securities      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, at fair value 59,000,000    
Novae Syndicate 2007 | Fixed maturities and short-term investments      
Statutory Financial Information [Line Items]      
Financial instruments, as collateral, at fair value $ 564,000,000