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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($) | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
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Interest rate futures | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 1,800,000,000 | $ 2,200,000,000 |
Interest rate futures | Short |  |  |
Derivative [Line Items] |  |  |
Notional amount | 300,000,000 | 500,000,000 |
Interest rate swaps |  |  |
Derivative [Line Items] |  |  |
Notional amount |  | 0 | $ 0
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | 1,000,000,000 | 915,000,000 |
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |  |
Derivative [Line Items] |  |  |
Notional amount | 473,700,000 | 329,300,000 |
Foreign currency forward contracts, investment operations | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | 219,800,000 | 245,800,000 |
Foreign currency forward contracts, investment operations | Short |  |  |
Derivative [Line Items] |  |  |
Notional amount | 87,100,000 | 131,000,000 |
Credit default swaps | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,400,000 | 0 |
Credit default swaps | Short |  |  |
Derivative [Line Items] |  |  |
Notional amount | 3,500,000 | 218,500,000 |
Total return swaps | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | 0 | 0 |
Equity futures | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 112,500,000 | $ 74,300,000 |

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