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INVESTMENTS - Held-to-Maturity Debt Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | $ 22,622 |  | $ 24,474
Allowance for Credit Loss | 9 |  | 10
Net Carrying Amount | 22,613 | [1] | 24,464
Gross Unrealized Gains | 5,135 |  | 5,935
Gross Unrealized Losses | 0 |  | 0
Fair Value | 27,748 |  | 30,399
Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22,622 |  | 24,474
Allowance for Credit Loss | 9 |  | 10
Net Carrying Amount | 22,613 |  | 24,464
Gross Unrealized Gains | 5,135 |  | 5,935
Gross Unrealized Losses | 0 |  | 0
Fair Value | 27,748 |  | 30,399
Japan government and agencies | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 21,676 |  | 23,448
Allowance for Credit Loss | 3 |  | 3
Net Carrying Amount | 21,673 |  | 23,445
Gross Unrealized Gains | 4,868 |  | 5,625
Gross Unrealized Losses | 0 |  | 0
Fair Value | 26,541 |  | 29,070
Municipalities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 346 |  | 377
Fair Value | 453 |  | 499
Municipalities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 346 |  | 377
Allowance for Credit Loss | 0 |  | 0
Net Carrying Amount | 346 |  | 377
Gross Unrealized Gains | 107 |  | 122
Gross Unrealized Losses | 0 |  | 0
Fair Value | 453 |  | 499
Public utilities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 44 |  | 47
Fair Value | 57 |  | 61
Public utilities | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 45 |  | 48
Allowance for Credit Loss | 1 |  | 1
Net Carrying Amount | 44 |  | 47
Gross Unrealized Gains | 13 |  | 14
Gross Unrealized Losses | 0 |  | 0
Fair Value | 57 |  | 61
Sovereign and supranational |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 528 |  | 571
Fair Value | 667 |  | 736
Sovereign and supranational | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 533 |  | 577
Allowance for Credit Loss | 5 |  | 6
Net Carrying Amount | 528 |  | 571
Gross Unrealized Gains | 139 |  | 165
Gross Unrealized Losses | 0 |  | 0
Fair Value | 667 |  | 736
Other corporate |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22 |  | 24
Fair Value | 30 |  | 33
Other corporate | Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22 |  | 24
Allowance for Credit Loss | 0 |  | 0
Net Carrying Amount | 22 |  | 24
Gross Unrealized Gains | 8 |  | 9
Gross Unrealized Losses | 0 |  | 0
Fair Value | $ 30 |  | $ 33
[1] | Net of allowance for credit losses

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