| Document and Entity Information | Mar. 12, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 9, 2021 |
| Entity Registrant Name | Booking Holdings Inc. |
| Entity Central Index Key | 0001075531 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-36691 |
| Entity Tax Identification Number | 06-1528493 |
| Entity Address, Address Line One | 800 Connecticut Avenue |
| Entity Address, City or Town | Norwalk |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06854 |
| City Area Code | 203 |
| Local Phone Number | 299-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock par value $0.008 per share |
| Trading Symbol | BKNG |
| Security Exchange Name | NASDAQ |
| 0.800% Senior Notes Due 2022 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 0.800% Senior Notes Due 2022 |
| Trading Symbol | BKNG 22A |
| Security Exchange Name | NASDAQ |
| 2.150% Senior Notes Due 2022 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 2.150% Senior Notes Due 2022 |
| Trading Symbol | BKNG 22 |
| Security Exchange Name | NASDAQ |
| 2.375% Senior Notes Due 2024 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 2.375% Senior Notes Due 2024 |
| Trading Symbol | BKNG 24 |
| Security Exchange Name | NASDAQ |
| 1.800% Senior Notes Due 2027 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 1.800% Senior Notes Due 2027 |
| Trading Symbol | BKNG 27 |
| Security Exchange Name | NASDAQ |
