Schedule I - Condensed Statements of Income And Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions
Net income attributable to IQVIA Holdings Inc.	$ 966	$ 279	$ 191
Comprehensive income attributable to IQVIA Holdings Inc.	775	385	104
Parent Company
Condensed Financial Statements, Captions
Equity in earnings of subsidiary	966	279	191
Net income attributable to IQVIA Holdings Inc.	966	279	191
Equity in other comprehensive (loss) income of subsidiary, net of tax	(191)	106	(87)
Comprehensive income attributable to IQVIA Holdings Inc.	$ 775	$ 385	$ 104