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INVESTMENTS - Schedule of Held-to-Maturity, Allowance for Credit Loss Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ (8) | $ 0 | $ (9) | $ 0
losses were not previously recorded | 0 | (9) | 0 | (9)
Increases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Decreases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Reduction in allowance due to disposals | 0 | 0 | 0 | 0
Balance, end of period | (8) | (9) | (8) | (9)
Corporate Securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (2) | 0 | (2) | 0
losses were not previously recorded | 0 | (2) | 0 | (2)
Increases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Decreases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Reduction in allowance due to disposals | 0 | 0 | 0 | 0
Balance, end of period | (2) | (2) | (2) | (2)
Asset-backed Securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (6) | 0 | (6) | 0
losses were not previously recorded | 0 | (6) | 0 | (6)
Increases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Decreases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Reduction in allowance due to disposals | 0 | 0 | 0 | 0
Balance, end of period | (5) | (6) | (5) | (6)
Foreign corporate securities |  |  |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | (1) | 0 | (1) | 0
losses were not previously recorded | 0 | (1) | 0 | (1)
Increases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Decreases in allowance on previously impaired securities | 0 | 0 | 0 | 0
Reduction in allowance due to disposals | 0 | 0 | 0 | 0
Balance, end of period | $ (1) | $ (1) | $ (1) | $ (1)

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- Definition Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not Previously Recorded + References No definition available. + Details
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Namespace Prefix: | eg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Expense + References No definition available. + Details
Name: | eg_DebtSecuritiesHeldToMaturityAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpense
Namespace Prefix: | eg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Not To Sell Before Recovery, Credit Loss, Previously Recorded, Reversal + References No definition available. + Details
Name: | eg_DebtSecuritiesHeldToMaturityAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedReversal
Namespace Prefix: | eg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Debt Securities, Held-To-Maturity, Excluding Accrued Interest, Allowance for Credit Loss, Securities Sold + References No definition available. + Details
Name: | eg_DebtSecuritiesHeldToMaturityExcludingAccruedInterestAllowanceForCreditLossSecuritiesSold
Namespace Prefix: | eg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |