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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
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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

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