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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | $ 17,472 |  | $ 22,008
Allowance for Credit Loss | 6 |  | 8
Total fixed maturity securities, held to maturity, amortized cost | 17,466 | [1] | 22,000
Gross Unrealized Gains | 2,619 |  | 4,869
Gross Unrealized Losses | 0 |  | 0
Fair Value | 20,085 |  | 26,869
Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 17,472 |  | 22,008
Allowance for Credit Loss | 6 |  | 8
Total fixed maturity securities, held to maturity, amortized cost | 17,466 |  | 22,000
Gross Unrealized Gains | 2,619 |  | 4,869
Gross Unrealized Losses | 0 |  | 0
Fair Value | 20,085 |  | 26,869
Japan government and agencies | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 16,745 |  | 21,089
Allowance for Credit Loss | 3 |  | 3
Total fixed maturity securities, held to maturity, amortized cost | 16,742 |  | 21,086
Gross Unrealized Gains | 2,483 |  | 4,613
Gross Unrealized Losses | 0 |  | 0
Fair Value | 19,225 |  | 25,699
Municipalities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 264 |  | 335
Fair Value | 321 |  | 436
Municipalities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 264 |  | 335
Allowance for Credit Loss | 0 |  | 0
Total fixed maturity securities, held to maturity, amortized cost | 264 |  | 335
Gross Unrealized Gains | 57 |  | 101
Gross Unrealized Losses | 0 |  | 0
Fair Value | 321 |  | 436
Public utilities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 34 |  | 43
Fair Value | 41 |  | 55
Public utilities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 34 |  | 44
Allowance for Credit Loss | 0 |  | 1
Total fixed maturity securities, held to maturity, amortized cost | 34 |  | 43
Gross Unrealized Gains | 7 |  | 12
Gross Unrealized Losses | 0 |  | 0
Fair Value | 41 |  | 55
Sovereign and supranational |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 409 |  | 514
Fair Value | 477 |  | 650
Sovereign and supranational | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 412 |  | 518
Allowance for Credit Loss | 3 |  | 4
Total fixed maturity securities, held to maturity, amortized cost | 409 |  | 514
Gross Unrealized Gains | 68 |  | 136
Gross Unrealized Losses | 0 |  | 0
Fair Value | 477 |  | 650
Other corporate |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 17 |  | 22
Fair Value | 21 |  | 29
Other corporate | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity, fixed maturity securities, amortized cost | 17 |  | 22
Allowance for Credit Loss | 0 |  | 0
Total fixed maturity securities, held to maturity, amortized cost | 17 |  | 22
Gross Unrealized Gains | 4 |  | 7
Gross Unrealized Losses | 0 |  | 0
Fair Value | $ 21 |  | $ 29
[1] | Net of allowance for credit losses

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