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Market Risk Benefits (Instrument Specific Credit Risk) (Details) - USD ($) $ in Millions		Sep. 30, 2025	Sep. 30, 2024
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		$ (219)	$ (233)
Market Risk Benefit, Asset, Amount	[1]	19	14
Market Risk Benefit, Liability, Amount		238	247
Insurance, Other | Americas [Member] | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		(219)	(233)
Market Risk Benefit, Asset, Amount	[1]	19	14
Market Risk Benefit, Liability, Amount		$ 238	$ 247
[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

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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

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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.

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