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STATUTORY FINANCIAL INFORMATION (Details) | 12 Months Ended
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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 |  |

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- Definition The minimum solvency margin amount, which is a factor of the minimum statutory capital and surplus calculation, required to be maintained, in terms of the Insurance Act 1978, amendments thereto and Related Regulations of Bermuda. + References No definition available. + Details
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- Definition The minimum solvency margin amount, which is a factor of the minimum statutory capital and surplus calculation, (expressed as a percentage of net reserve for losses and loss adjustment expenses) required to be maintained, in terms of the Insurance Act 1978, amendments thereto and Related Regulations of Bermuda. + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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