| Document and Entity Information | Feb. 16, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001478242 |
| Document Type | 8-K |
| Document Period End Date | Feb. 16, 2021 |
| Entity Registrant Name | IQVIA HOLDINGS INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35907 |
| Entity Tax Identification Number | 27-1341991 |
| Entity Address, Address Line One | 4820 Emperor Blvd. |
| Entity Address, City or Town | Durham |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 27703 |
| City Area Code | (919) |
| Local Phone Number | 998-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | IQV |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
