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DERIVATIVE INSTRUMENTS - Narrative (Details) - Derivative instruments not designated as hedges - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Interest rate futures | Long |  |
Derivative [Line Items] |  |
Notional amount | $ 5,200,000,000 | $ 5,900,000,000
Interest rate futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 2,700,000,000 | 2,700,000,000
Foreign currency forward contracts, underwriting and non-investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 379,800,000 | 805,200,000
Foreign currency forward contracts, underwriting and non-investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 384,400,000 | 496,400,000
Foreign currency forward contracts, investment operations | Long |  |
Derivative [Line Items] |  |
Notional amount | 297,700,000 | 420,700,000
Foreign currency forward contracts, investment operations | Short |  |
Derivative [Line Items] |  |
Notional amount | 100,200,000 | 130,000,000
Credit default swaps | Long |  |
Derivative [Line Items] |  |
Notional amount | 1,500,000,000 | 1,500,000,000
Credit default swaps | Short |  |
Derivative [Line Items] |  |
Notional amount | 12,500,000 | 22,100,000
Equity futures | Long |  |
Derivative [Line Items] |  |
Notional amount |  | 0
Equity futures | Short |  |
Derivative [Line Items] |  |
Notional amount | 0 |
Commodity futures | Long |  |
Derivative [Line Items] |  |
Notional amount | 374,000,000 | 255,200,000
Commodity options | Long |  |
Derivative [Line Items] |  |
Notional amount | 44,000 | 400,000
Commodity options | Short |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 0

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