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Net Investment Gains (Losses) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Available-for-sale fixed maturity securities: |  |  |  |  |
Realized gains |  | $ 21 | $ 18 | $ 28 | $ 21
Realized losses |  | (40) | (48) | (69) | (67)
Net realized gains (losses) on available-for-sale fixed maturity securities |  | (19) | (30) | (41) | (46)
Net realized gains (losses) on equity securities sold |  | 0 | (1) | 0 | (1)
Total net realized investment gains (losses) |  | (19) | (31) | (41) | (47)
Net change in allowance for credit losses on available-for-sale fixed maturity securities |  | 7 | 11 | 7 | (4)
Write-down of available-for-sale fixed maturity securities | [1] | 0 | (1) | 0 | (1)
Net unrealized gains (losses) on equity securities still held |  | 12 | 21 | 44 | 32
Net unrealized gains (losses) on limited partnerships |  | (52) | 40 | (9) | 40
Commercial mortgage loans |  | (1) | 0 | (3) | (2)
Derivative instruments | [2] | (8) | (1) | (7) | 11
Other |  | 0 | 0 | (3) | (1)
Total net investment gains (losses) |  | $ (61) | $ 39 | $ (12) | $ 28
[1] | Represents write-down of securities deemed uncollectible or that we intend to sell or will be required to sell prior to recovery of the amortized cost basis.
[2] | See note 5 for additional information on the impact of derivative instruments included in net investment gains (losses).

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