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Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities Reported in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments [Abstract] |  |  |  |  |
Beginning balance |  | $ (2,615) | $ (2,500) | $ (2,130) | $ (3,407)
Unrealized gains (losses) on fixed maturity securities |  | (575) | (755) | (1,229) | 415
Adjustments to policyholder contract balances | [1] | 13 | 13 | 27 | (6)
Provision for income taxes |  | 120 | 158 | 257 | (87)
Change in unrealized gains (losses) on investment securities |  | (442) | (584) | (945) | 322
Reclassification adjustments to net investment (gains) losses, net of taxes of $(4), $(7), $(9) and $(10) |  | 15 | 23 | 32 | 36
Change in net unrealized investment gains (losses) |  | (427) | (561) | (913) | 358
Less: change in net unrealized investment gains (losses) attributable to noncontrolling interests |  | 0 | (5) | (1) | 7
Ending balance |  | $ (3,042) | $ (3,056) | $ (3,042) | $ (3,056)
[1] | See note 10 for additional information.

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