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Long-duration Contracts - Discounted Future Gross Premiums (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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Insurance [Abstract] |  |
Expected future benefit payments, Undiscounted | $ 77,248 | $ 60,043
Expected future benefit payments, Discounted | $ 52,905 | $ 41,756

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- Definition Liability for Future Policy Benefit, Expected Future Policy Benefit, Discounted, before Reinsurance + References No definition available. + Details
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Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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- Definition Amount, before effect of reinsurance, of undiscounted balance for expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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