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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | $ 16,694 |  | $ 17,824 |  |
Allowance for Credit Loss | 5 |  | 5 | $ 6 | $ 7
Total fixed maturity securities, held-to- maturity, amortized cost | 16,689 | [1] | 17,819 |  |
Gross Unrealized Gains | 1,556 |  | 1,838 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 18,245 |  | 19,657 |  |
Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 16,694 |  | 17,824 |  |
Allowance for Credit Loss | 5 |  | 5 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 16,689 |  | 17,819 |  |
Gross Unrealized Gains | 1,556 |  | 1,838 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 18,245 |  | 19,657 |  |
Japan government and agencies | Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 16,002 |  | 17,085 |  |
Allowance for Credit Loss | 2 |  | 2 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 16,000 |  | 17,083 |  |
Gross Unrealized Gains | 1,474 |  | 1,746 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 17,474 |  | 18,829 |  |
Municipalities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 248 |  | 266 |  |
Fair Value | 285 |  | 307 |  |
Municipalities | Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 248 |  | 266 |  |
Allowance for Credit Loss | 0 |  | 0 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 248 |  | 266 |  |
Gross Unrealized Gains | 37 |  | 41 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 285 |  | 307 |  |
Public utilities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 33 |  | 34 |  |
Fair Value | 36 |  | 38 |  |
Public utilities | Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 33 |  | 34 |  |
Allowance for Credit Loss | 0 |  | 0 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 33 |  | 34 |  |
Gross Unrealized Gains | 3 |  | 4 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 36 |  | 38 |  |
Sovereign and supranational |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 391 |  | 418 |  |
Fair Value | 431 |  | 462 |  |
Sovereign and supranational | Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 394 |  | 421 |  |
Allowance for Credit Loss | 3 |  | 3 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 391 |  | 418 |  |
Gross Unrealized Gains | 40 |  | 44 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | 431 |  | 462 |  |
Other corporate |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 17 |  | 18 |  |
Fair Value | 19 |  | 21 |  |
Other corporate | Yen-denominated |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | 17 |  | 18 |  |
Allowance for Credit Loss | 0 |  | 0 |  |
Total fixed maturity securities, held-to- maturity, amortized cost | 17 |  | 18 |  |
Gross Unrealized Gains | 2 |  | 3 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Fair Value | $ 19 |  | $ 21 |  |
[1] | Net of allowance for credit losses

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