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Market Risk Benefits (Instrument Specific Credit Risk) (Details) - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		$ (216)	$ (259)
Market Risk Benefit, Asset, Amount	[1]	8	0
Market Risk Benefit, Liability, Amount		224	259
Insurance, Other | Americas [Member] | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		(216)	(259)
Market Risk Benefit, Asset, Amount	[1]	8	0
Market Risk Benefit, Liability, Amount		$ 224	$ 259
[1] Included in Other assets

X

- Definition

Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Section 50
-Paragraph 7B
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-URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
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-Publisher FASB
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- Definition

Amount of asset position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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-Section 55
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-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G

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Amount of liability position for contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G

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