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Summary of Market Risk Benefit (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Market Risk Benefit [Line Items]
Asset	$ 54	$ 43
Liability	500	625
Net liability	446	582
Fixed Indexed Annuities
Market Risk Benefit [Line Items]
Asset	0	0
Liability	43	55
Net liability	43	55
Variable Annuities
Market Risk Benefit [Line Items]
Asset	54	43
Liability	457	570
Net liability	$ 403	$ 527

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
-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Paragraph 3
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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

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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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