| Document and Entity Information | Sep. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 12, 2024 |
| Entity Registrant Name | 2U, LLC |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36376 |
| Entity Tax Identification Number | 26-2335939 |
| Entity Address Address Line 1 | 2345 Crystal Drive |
| Entity Address Address Line 2 | Suite 1100 |
| Entity Address City Or Town | Arlington |
| Entity Address State Or Province | VA |
| Entity Address Postal Zip Code | 22202 |
| City Area Code | 301 |
| Local Phone Number | 892-4350 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 par value per share |
| Trading Symbol | TWOU |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Current Fiscal Year End Date | --12-31 |
| Entity Central Index Key | 0001459417 |
| Amendment Flag | false |
