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Future Policy Benefits - Summary of Undiscounted and Discounted Expected Future Gross Premiums and Expected Future Benefit Payments (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Long-term Care Insurance      
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]      
Liability for future policy benefit expected future gross premium undiscounted before reinsurance $ 36,523 $ 38,279  
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance 122,000 124,594  
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance 24,512 26,341  
Liability for future policy benefit, expected future policy benefit discounted before reinsurance 58,417 62,579 $ 61,352
Life Insurance      
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]      
Liability for future policy benefit expected future gross premium undiscounted before reinsurance 10,292 10,693  
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance 7,107 7,524  
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance 5,788 6,278  
Liability for future policy benefit, expected future policy benefit discounted before reinsurance 4,975 5,412 5,556
Fixed annuities      
Disclosure In Tabular Form Of Undiscounted And Discounted Expected Future Gross Premiums And Expected Future Benefit Payments [Line Items]      
Liability for future policy benefit expected future gross premium undiscounted before reinsurance 0 0  
Liability for future policy benefit expected future policy benefit undiscounted before reinsurance 23,385 23,903  
Liability for future policy Benefit, expected future gross premium, discounted, before reinsurance 0 0  
Liability for future policy benefit, expected future policy benefit discounted before reinsurance $ 10,972 $ 11,829 $ 11,923