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COMMITMENTS AND CONTINGENCIES (Details) € in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 33 Months Ended | 79 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2024 EUR (€) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Aug. 31, 2021 USD ($) | Aug. 31, 2021 EUR (€) | Dec. 31, 2023 USD ($) | Sep. 30, 2024 EUR (€) | Jan. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | $ 262 |  | $ 262 |  |  | $ 67 |  |  |  | $ 67 |  |  |
Deferred income tax benefit |  |  |  |  |  | 75 |  | $ 409 |  |  |  |  |  |  |  |
Partner liability insurance maximum coverage per occurrence |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
ITALY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term rental tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 21.00% |  |  |
Standby Letters of Credit and Bank Guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit and bank guarantees issued |  |  |  | 652 |  | 652 |  |  | 533 |  |  |  | $ 533 |  |  |
Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accruals for loss contingencies | € | € 413 |  |  |  |  |  |  |  |  |  |  |  |  |  | € 486 |
Loss contingency accrual, provision |  |  |  |  |  |  |  |  | 530 | € 486 |  |  |  |  |  |
Loss contingency accrual, period decrease | € 72 |  |  |  |  | 78 | € 72 |  |  |  |  |  |  |  |  |
Italian Tax Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | 37 |  | 37 |  |  | 37 |  |  |  | $ 37 | € 33 |  | € 33
Deferred income tax benefit |  |  |  |  |  |  |  |  | 17 | 15 |  |  |  |  |  |
Prepayments made to appeal a litigation matter or avoid collection enforcement |  |  |  | 83 |  | 83 |  |  |  |  |  |  |  | € 74 |  |
Italian Tax Matters | Tax Years 2013 Through 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax assessments |  |  |  |  |  |  |  |  |  |  | $ 280 | € 251 |  |  |  |
Pension-related litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision |  |  |  | 14 | € 13 | 55 | 50 |  | $ 276 | € 253 |  |  |  |  |  |
Guardia di Finanza of Rome Tax Audit | Tax Periods June 2017 through December 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual, provision |  |  |  | $ 365 | € 329 | $ 365 | € 329 |  |  |  |  |  |  |  |  |
Recommended tax assessment |  | $ 442 | € 396 |  |  |  |  |  |  |  |  |  |  |  |  |

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