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Changes In Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Postretirement benefit obligations, current period OCI	$ 30	$ 34
Postretirement benefit obligations, current period OCI, tax	(8)	(9)
Foreign currency translation and other adjustments, current period OCI, tax	1	1
Change in the discount rate used to measure future policy benefits, current period OCI, tax	(169)	255
Change in instrument-specific credit risk of MRBs, current period OCI, tax	$ 1	$ 2

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Amount, after reclassification adjustment, of tax expense (benefit) for unrealized gain (loss) from (increase) decrease in liability for future policy benefit from change in discount rate.

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Amount, after adjustments, of tax expense (benefit) for unrealized gain (loss) from (increase) decrease in instrument-specific credit risk on 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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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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