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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | $ 16,960 |  |  | $ 15,971 |  |  |
Allowance for Credit Loss | 5 |  | $ 5 | 5 | $ 5 | $ 5 | $ 5
Total fixed maturity securities, held-to-maturity, amortized cost | 16,955 | [1] |  | 15,966 |  |  |
Gross Unrealized Gains | 260 |  |  | 815 |  |  |
Gross Unrealized Losses | 445 |  |  | 9 |  |  |
Fair Value | 16,770 |  |  | 16,772 |  |  |
Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 16,960 |  |  | 15,971 |  |  |
Allowance for Credit Loss | 5 |  |  | 5 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 16,955 |  |  | 15,966 |  |  |
Gross Unrealized Gains | 260 |  |  | 815 |  |  |
Gross Unrealized Losses | 445 |  |  | 9 |  |  |
Fair Value | 16,770 |  |  | 16,772 |  |  |
Japan government and agencies | Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 16,260 |  |  | 15,311 |  |  |
Allowance for Credit Loss | 2 |  |  | 2 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 16,258 |  |  | 15,309 |  |  |
Gross Unrealized Gains | 248 |  |  | 759 |  |  |
Gross Unrealized Losses | 438 |  |  | 9 |  |  |
Fair Value | 16,068 |  |  | 16,059 |  |  |
Municipalities |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 248 |  |  | 235 |  |  |
Fair Value | 252 |  |  | 257 |  |  |
Municipalities | Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 248 |  |  | 235 |  |  |
Allowance for Credit Loss | 0 |  |  | 0 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 248 |  |  | 235 |  |  |
Gross Unrealized Gains | 5 |  |  | 22 |  |  |
Gross Unrealized Losses | 1 |  |  | 0 |  |  |
Fair Value | 252 |  |  | 257 |  |  |
Public utilities |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 34 |  |  | 32 |  |  |
Fair Value | 32 |  |  | 33 |  |  |
Public utilities | Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 34 |  |  | 32 |  |  |
Allowance for Credit Loss | 0 |  |  | 0 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 34 |  |  | 32 |  |  |
Gross Unrealized Gains | 0 |  |  | 1 |  |  |
Gross Unrealized Losses | 2 |  |  | 0 |  |  |
Fair Value | 32 |  |  | 33 |  |  |
Sovereign and supranational |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 398 |  |  | 374 |  |  |
Fair Value | 400 |  |  | 405 |  |  |
Sovereign and supranational | Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 401 |  |  | 377 |  |  |
Allowance for Credit Loss | 3 |  |  | 3 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 398 |  |  | 374 |  |  |
Gross Unrealized Gains | 6 |  |  | 31 |  |  |
Gross Unrealized Losses | 4 |  |  | 0 |  |  |
Fair Value | 400 |  |  | 405 |  |  |
Other corporate |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 17 |  |  | 16 |  |  |
Fair Value | 18 |  |  | 18 |  |  |
Other corporate | Yen-denominated |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |
Amortized Cost | 17 |  |  | 16 |  |  |
Allowance for Credit Loss | 0 |  |  | 0 |  |  |
Total fixed maturity securities, held-to-maturity, amortized cost | 17 |  |  | 16 |  |  |
Gross Unrealized Gains | 1 |  |  | 2 |  |  |
Gross Unrealized Losses | 0 |  |  | 0 |  |  |
Fair Value | $ 18 |  |  | $ 18 |  |  |
[1] | Net of allowance for credit losses

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