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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | $ 18,942 |  | $ 19,063
Allowance for Credit Loss | 6 |  | 7
Total fixed maturity securities, held to maturity, amortized cost | 18,936 | [1] | 19,056
Gross Unrealized Gains | 2,680 |  | 2,154
Gross Unrealized Losses | 0 |  | 0
Fair Value | 21,616 |  | 21,210
Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 18,942 |  | 19,063
Allowance for Credit Loss | 6 |  | 7
Total fixed maturity securities, held to maturity, amortized cost | 18,936 |  | 19,056
Gross Unrealized Gains | 2,680 |  | 2,154
Gross Unrealized Losses | 0 |  | 0
Fair Value | 21,616 |  | 21,210
Japan government and agencies | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 18,154 |  | 18,269
Allowance for Credit Loss | 2 |  | 2
Total fixed maturity securities, held to maturity, amortized cost | 18,152 |  | 18,267
Gross Unrealized Gains | 2,548 |  | 2,045
Gross Unrealized Losses | 0 |  | 0
Fair Value | 20,700 |  | 20,312
Municipalities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 285 |  | 287
Fair Value | 341 |  | 335
Municipalities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 285 |  | 287
Allowance for Credit Loss | 0 |  | 0
Total fixed maturity securities, held to maturity, amortized cost | 285 |  | 287
Gross Unrealized Gains | 56 |  | 48
Gross Unrealized Losses | 0 |  | 0
Fair Value | 341 |  | 335
Public utilities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 37 |  | 37
Fair Value | 42 |  | 41
Public utilities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 37 |  | 38
Allowance for Credit Loss | 0 |  | 1
Total fixed maturity securities, held to maturity, amortized cost | 37 |  | 37
Gross Unrealized Gains | 5 |  | 4
Gross Unrealized Losses | 0 |  | 0
Fair Value | 42 |  | 41
Sovereign and supranational |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 443 |  | 446
Fair Value | 510 |  | 500
Sovereign and supranational | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 447 |  | 450
Allowance for Credit Loss | 4 |  | 4
Total fixed maturity securities, held to maturity, amortized cost | 443 |  | 446
Gross Unrealized Gains | 67 |  | 54
Gross Unrealized Losses | 0 |  | 0
Fair Value | 510 |  | 500
Other corporate |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 19 |  | 19
Fair Value | 23 |  | 22
Other corporate | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 19 |  | 19
Allowance for Credit Loss | 0 |  | 0
Total fixed maturity securities, held to maturity, amortized cost | 19 |  | 19
Gross Unrealized Gains | 4 |  | 3
Gross Unrealized Losses | 0 |  | 0
Fair Value | $ 23 |  | $ 22
[1] | Net of allowance for credit losses

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