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Market Risk Benefits (Instrument Specific Credit Risk) (Details) - USD ($) $ in Millions		Mar. 31, 2025	Mar. 31, 2024
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		$ (230)	$ (214)
Market Risk Benefit, Asset, Amount	[1]	13	14
Market Risk Benefit, Liability, Amount		243	228
Insurance, Other | Americas [Member] | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk		(230)	(214)
Market Risk Benefit, Asset, Amount	[1]	13	14
Market Risk Benefit, Liability, Amount		$ 243	$ 228
[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.

+ References

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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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