Earnings Per Share - Reconciles the Basic to Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to IQVIA Holdings Inc.	$ 283	$ 261	$ 864	$ 648
Denominator:
Basic weighted average common shares outstanding (in shares)	186.5	191.5	188.3	191.5
Effect of dilutive stock options and share awards (in shares)	2.9	3.8	3.0	3.5
Diluted weighted average common shares outstanding (in shares)	189.4	195.3	191.3	195.0
Earnings per share attributable to common stockholders:
Basic (in dollars per share)	$ 1.52	$ 1.36	$ 4.59	$ 3.38
Diluted (in dollars per share)	$ 1.49	$ 1.34	$ 4.52	$ 3.32