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Long-duration Contracts - Remeasurement Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Insurance [Abstract]
Reserves			$ 60	$ 90
Deferred profit liability			(44)	(85)
Negative VOBA			(10)	5
Total remeasurement gains (losses)	$ 8	$ 7	$ 6	$ 10

X

- Definition

Liability for Future Policy Benefit, Deferred Profit Liability

+ References

No definition available.

+ Details

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X

- Definition

Liability for Future Policy Benefit, Remeasurement Gain (Loss), Negative VOBA

+ References

No definition available.

+ Details

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X

- Definition

Liability for Future Policy Benefit, Remeasurement Gain (Loss), Reserves

+ References

No definition available.

+ Details

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Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

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X

- Definition

Amount of remeasurement gain (loss) on liability for future policy benefit from application of revised benefit ratio as of contract issue. Includes, but is not limited to, remeasurement gain (loss) for annuitization insurance benefit, death and other insurance benefits, and traditional and limited-payment contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480112/944-40-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480112/944-40-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480112/944-40-45-4

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