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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 2,600,000,000 | $ 2,400,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 700,000,000 | 500,000,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 845,200,000 | 861,700,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 183,200,000 | 172,400,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 383,200,000 | 225,600,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 98,700,000 | 86,300,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 14,500,000 | 953,400,000
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 1,000,000,000 | 13,100,000
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount |  | $ 116,000,000
Equity futures | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 0 |

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