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INVESTMENTS - Held-to-Maturity Debt Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | $ 15,971 |  | $ 17,824 |  |
Allowance for Credit Losses | 5 |  | 5 | $ 7 | $ 8
Total fixed maturity securities held to maturity | 15,966 | [1] | 17,819 |  |
Gross Unrealized Gains | 815 |  | 1,838 |  |
Gross Unrealized Losses | 9 |  | 0 |  |
Fair Value | 16,772 |  | 19,657 |  |
Municipalities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 235 |  | 266 |  |
Fair Value | 257 |  | 307 |  |
Public utilities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 32 |  | 34 |  |
Fair Value | 33 |  | 38 |  |
Sovereign and supranational |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 374 |  | 418 |  |
Fair Value | 405 |  | 462 |  |
Other corporate |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 16 |  | 18 |  |
Fair Value | 18 |  | 21 |  |
Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 15,971 |  | 17,824 |  |
Allowance for Credit Losses | 5 |  | 5 |  |
Total fixed maturity securities held to maturity | 15,966 |  | 17,819 |  |
Gross Unrealized Gains | 815 |  | 1,838 |  |
Gross Unrealized Losses | 9 |  | 0 |  |
Fair Value | 16,772 |  | 19,657 |  |
Yen-denominated | Japan government and agencies |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 15,311 |  | 17,085 |  |
Allowance for Credit Losses | 2 |  | 2 |  |
Total fixed maturity securities held to maturity | 15,309 |  | 17,083 |  |
Gross Unrealized Gains | 759 |  | 1,746 |  |
Gross Unrealized Losses | 9 |  | 0 |  |
Fair Value | 16,059 |  | 18,829 |  |
Yen-denominated | Municipalities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 235 |  | 266 |  |
Allowance for Credit Losses | 0 |  | 0 |  |
Total fixed maturity securities held to maturity | 235 |  | 266 |  |
Gross Unrealized Gains | 22 |  | 41 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 257 |  | 307 |  |
Yen-denominated | Public utilities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 32 |  | 34 |  |
Allowance for Credit Losses | 0 |  | 0 |  |
Total fixed maturity securities held to maturity | 32 |  | 34 |  |
Gross Unrealized Gains | 1 |  | 4 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 33 |  | 38 |  |
Yen-denominated | Sovereign and supranational |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 377 |  | 421 |  |
Allowance for Credit Losses | 3 |  | 3 |  |
Total fixed maturity securities held to maturity | 374 |  | 418 |  |
Gross Unrealized Gains | 31 |  | 44 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 405 |  | 462 |  |
Yen-denominated | Other corporate |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 16 |  | 18 |  |
Allowance for Credit Losses | 0 |  | 0 |  |
Total fixed maturity securities held to maturity | 16 |  | 18 |  |
Gross Unrealized Gains | 2 |  | 3 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | $ 18 |  | $ 21 |  |
[1] | Net of allowance for credit losses

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