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COMMITMENTS AND CONTINGENCIES (Details) ₺ in Millions, € in Millions, £ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Aug. 31, 2021 USD ($) | Aug. 31, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Jun. 30, 2021 EUR (€) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Jan. 31, 2019 USD ($) | Jan. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Sep. 30, 2016 USD ($) | Sep. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 TRY (₺) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2016 EUR (€)
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | $ 97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 97 |  |  |  |  | $ 84 |  |  |  |
Booking.com | Headquarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 313 |  |  |  |  |  | 25 |  |  | € 22 |  |  |  |  |  | € 270
Acquisition of land use rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48 | € 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Booking.com | Headquarters | Headquarters Vendors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 |  |  | 27 |  |  |  |  |  |
Booking.com | Headquarters | Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining lease payments |  | $ 79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79 |  |  | € 69 |  |  |  |  |  |
Rentalcars.com | Headquarters | Manchester, England |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term of operating leases which have not commenced at period end |  | 13 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  | 13 years | 13 years |  |  |  |  |
Rentalcars.com | Headquarters | Operating Lease Obligations | Manchester, England |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  | $ 71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71 |  |  |  | £ 52 |  |  |  |  |
Potential Fine under Contractual Parity Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accruals for loss contingencies |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  | € 14 |  | 23 | € 18 |  |  |
French Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59 | 50 |  |  |
Estimated reasonably possible loss in excess of amount accrued |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  | € 20 |  |  |  |  |  |
French Tax Audit | Tax Year 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  | $ 81 | € 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
French Tax Audit | Tax Years 2006 Through 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 403 | € 356 |  |  |  |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  |  |  |  |  |  |  |  |  |  | $ 403 | € 356 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
French Tax Assessment, transfer taxes | Tax Years 2011 Through 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  | 45 | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected required prepayment deposit or bank guarantees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70 | € 60 |  |  |  |  |  |  |  |
Net unrecognized tax benefit recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16 | € 13 |  |  |  |  |  |  |  |  |  |
Income taxes, percent of tax and interest expected to be paid related to pending proceedings |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  | 33.00% | 33.00% |  |  |  |  |
Italian Tax Audit | Other assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 |  |  | € 5 |  | 6 | € 5 |  |  |
Italian Tax Audit | Tax Year 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55 | € 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  |  |  |  |  |  |  |  | 11 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Year 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  | $ 67 | € 58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Year 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  | $ 37 | € 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Years 2013 And 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5 | € 4 |
Italian Tax Audit | Tax Years 2013 through 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Tax, Recommended Assessment |  |  |  |  |  | $ 178 | € 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Years 2016 Through 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Tax, Assessment |  |  |  | $ 132 | € 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Turkish Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes including interest and penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 |  | ₺ 801 |  |  |  |  |  |  |
Swiss Tax Assessment | Tax Years 2015 Through 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Tax, Assessment |  | 54 | € 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hawaii Tax Assessment | Tax Years 2010 Through 2020 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Tax, Recommended Assessment | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Travel Transaction Related Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accruals for loss contingencies |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54 |  |  |  |  | $ 59 |  |  |  |
Estimated reasonably possible loss in excess of amount accrued |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Pension-related litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated reasonably possible loss in excess of amount accrued |  | 322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 322 |  |  | 278 |  |  |  |  |  |
Unfavorable Regulatory Action | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated possible fine per incident |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  | € 20 |  |  |  |  |  |

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