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COMMITMENTS AND CONTINGENCIES - Tax Matters (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended | 33 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2024 USD ($) | Nov. 30, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2021 USD ($) | Aug. 31, 2021 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2021 USD ($)
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  | $ 260 |  | $ 67 | $ 184 |  |  |  | $ 120
Deferred income tax expense (benefit) |  |  |  |  | 98 |  | $ (478) | $ (257) |  |  |  |
Italian Tax Audit |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  | 34 |  |  |  |  |  | € 33 |
Deferred income tax expense (benefit) |  |  |  |  | (16) | € (15) |  |  |  |  |  |
Payment required to appeal a litigation matter |  |  |  |  | $ 77 | € 74 |  |  |  |  |  |
Italian Tax Audit | Tax Year 2013 through 2018 |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |
Tax assessment |  |  |  |  |  |  |  |  | $ 260 | € 251 |  |
Guardia di Finanza of Rome Tax Audit | Tax Periods June 2017 through December 2023 |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, tax, proposed assessment |  |  | $ 410 | € 396 |  |  |  |  |  |  |  |
Loss contingency accrual, payments | $ 332 | € 313 |  |  |  |  |  |  |  |  |  |

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