BASIS OF PRESENTATION (Policies)	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Management of Booking Holdings Inc. (the "Company") is responsible for the Unaudited Consolidated Financial Statements included in this document, which have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and include all normal and recurring adjustments that management of the Company considers necessary for a fair presentation of its financial position and operating results. The Company prepared the Unaudited Consolidated Financial Statements following the requirements of the Securities and Exchange Commission for interim reporting. As permitted under those rules, the Company condensed or omitted certain footnotes or other financial information that are normally required by U.S. GAAP for annual financial statements. These Unaudited Consolidated Financial Statements should be read in combination with the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. Revenues, expenses, assets, and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be the same as those for any subsequent quarter or the full year.
Reclassification	Reclassification Certain amounts from prior periods have been reclassified to conform to the current period presentation. Stock Split On April 2, 2026, the Company effected the 25-for-1 stock split of its common stock (the "Stock Split") with a proportionate increase in the number of shares of authorized common stock, as approved by the Company's Board of Directors (the "Board") in January 2026. The shares of common stock retained their par value of $0.008. All share and per share information has been retroactively adjusted to reflect the Stock Split.
Recent Accounting Pronouncements	Recent Accounting Pronouncements See "Recent Accounting Pronouncements Adopted" and "Other Recent Accounting Pronouncements" in Note 2 to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. Measurement of Credit Losses for Accounts Receivable and Contract Assets In July 2025, the Financial Accounting Standards Board issued an Accounting Standards Update to simplify the application of the current expected credit loss model for current accounts receivable and current contract assets under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers. The update provides a practical expedient when estimating expected credit losses that assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset. In the first quarter of 2026, the Company adopted the practical expedient and it did not have a material impact to its Consolidated Financial Statements.
Earnings Per Share	The Company computes basic net income per share by dividing net income applicable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share is based upon the weighted-average number of common and common equivalent shares outstanding during the period. Only dilutive common equivalent shares that decrease the net income per share are included in the computation of diluted net income per share. Common equivalent shares related to stock options, restricted stock units, and performance share units are calculated using the treasury stock method. Performance share units are included in the weighted-average common equivalent shares based on the number of shares that would be issued if the end of the reporting period were the end of the performance period, if the result would be dilutive.
Income Tax	Income tax expense consists of U.S. and international income taxes, determined using an estimate of the Company's annual effective tax rate, which is based upon the applicable tax rates and tax laws of the countries in which the income is generated.

BASIS OF PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Management of Booking Holdings Inc. (the "Company") is responsible for the Unaudited Consolidated Financial Statements included in this document, which have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and include all normal and recurring adjustments that management of the Company considers necessary for a fair presentation of its financial position and operating results. The Company prepared the Unaudited Consolidated Financial Statements following the requirements of the Securities and Exchange Commission for interim reporting. As permitted under those rules, the Company condensed or omitted certain footnotes or other financial information that are normally required by U.S. GAAP for annual financial statements. These Unaudited Consolidated Financial Statements should be read in combination with the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. Revenues, expenses, assets, and liabilities can vary during each quarter of the year. Therefore, the results and trends in these interim financial statements may not be the same as those for any subsequent quarter or the full year.

Reclassification

Certain amounts from prior periods have been reclassified to conform to the current period presentation.

Stock Split

On April 2, 2026, the Company effected the 25-for-1 stock split of its common stock (the "Stock Split") with a proportionate increase in the number of shares of authorized common stock, as approved by the Company's Board of Directors (the "Board") in January 2026. The shares of common stock retained their par value of $0.008. All share and per share information has been retroactively adjusted to reflect the Stock Split.

Recent Accounting Pronouncements

See "Recent Accounting Pronouncements Adopted" and "Other Recent Accounting Pronouncements" in Note 2 to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2025.

Measurement of Credit Losses for Accounts Receivable and Contract Assets

In July 2025, the Financial Accounting Standards Board issued an Accounting Standards Update to simplify the application of the current expected credit loss model for current accounts receivable and current contract assets under Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers. The update provides a practical expedient when estimating expected credit losses that assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset. In the first quarter of 2026, the Company adopted the practical expedient and it did not have a material impact to its Consolidated Financial Statements.

Earnings Per Share

The Company computes basic net income per share by dividing net income applicable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share is based upon the weighted-average number of common and common equivalent shares outstanding during the period. Only dilutive common equivalent shares that decrease the net income per share are included in the computation of diluted net income per share.

Common equivalent shares related to stock options, restricted stock units, and performance share units are calculated using the treasury stock method. Performance share units are included in the weighted-average common equivalent shares based on the number of shares that would be issued if the end of the reporting period were the end of the performance period, if the result would be dilutive.

Income Tax

Income tax expense consists of U.S. and international income taxes, determined using an estimate of the Company's annual effective tax rate, which is based upon the applicable tax rates and tax laws of the countries in which the income is generated.