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COMMITMENTS AND CONTINGENCIES (Details) ₺ in Millions, € in Millions, $ in Millions |  | 1 Months Ended | 6 Months Ended | 24 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 08, 2022 USD ($) | Feb. 08, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2021 TRY (₺) | 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 (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 TRY (₺) | Jun. 30, 2022 EUR (€) | Apr. 30, 2022 USD ($) | Apr. 30, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Mar. 31, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 EUR (€)
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  | $ 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 113 |  |  |  |  |  |  |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued |  |  | 511 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 812 |  |  |  |  |  |  |  |  |  |  |  |
Booking.com | Headquarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  | € 5 |  |  |  |  |  |  |  |
Booking.com | Headquarters | Headquarters Vendors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  | 16 |  |  |  |  |  |  |  |
Booking.com | Headquarters | Ground Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining lease payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70 |  |  |  | 67 |  |  |  |  |  |  |  |
French Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59 | € 50 |  |
Estimated reasonably possible loss in excess of amount accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  |  |  | 20 |  |  |  |  |  |  |  |
French Tax Audit | Tax Years 2006 Through 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 372 | € 356 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 372 | € 356 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
French Tax Audit | Tax Years 2011 through 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes | $ 3 | € 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of tax deposit refunded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 | € 3 |  |  |  |  |  |
French Tax Audit | Tax Year 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  | $ 73 | € 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
French Tax Audit | Tax Years 2016 Through 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  | 81 | € 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
French Tax Assessment, transfer taxes | Tax Years 2011 Through 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  | 41 | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  |  |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 13 |  |  |  |
Italian Tax Audit | Other assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  | 5 |  |  | € 5 |  |  |  |  |
Italian Tax Audit | Tax Year 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | € 48 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Year 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  | $ 61 | € 58 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Year 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  | $ 33 | € 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recommended tax assessment |  |  |  |  |  |  |  | $ 161 | € 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Years 2016 Through 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  | $ 119 | € 114 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Italian Tax Audit | Tax Years 2014 Through 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67 | € 64 |  |  |  |  |  |  |  |  |  |  |
Turkish Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessed taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | ₺ 835 |  |  |  |  |  |  |  |  |
Payment required to appeal a litigation matter or avoid collection enforcement |  |  | $ 7 |  | ₺ 118 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension-related litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated reasonably possible loss in excess of amount accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 328 |  |  |  | € 313 |  |  |  |  |  |  |  |

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