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Summary of Significant Accounting Policies - Effect of Adoption of ASU 2014-09 on Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Trade accounts receivable and unbilled services, net $ 2,172 $ 2,097
Total current assets 3,587 3,554
Deferred income taxes 108 109
Total assets 22,626 22,857
Unearned income 940 985
Total current liabilities 3,166 3,156
Deferred income taxes 813 895
Total liabilities 15,012 14,613
Retained earnings 665 538
Accumulated other comprehensive income (104) 49
Equity attributable to IQVIA Holdings Inc.’s stockholders 7,364 7,995
Total stockholders’ equity 7,614 8,244
Total liabilities and stockholders’ equity $ 22,626 22,857
As Previously Reported [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Trade accounts receivable and unbilled services, net   1,993
Total current assets   3,450
Deferred income taxes   98
Total assets   22,742
Unearned income   733
Total current liabilities   2,904
Deferred income taxes   918
Total liabilities   14,384
Retained earnings   655
Accumulated other comprehensive income   46
Equity attributable to IQVIA Holdings Inc.’s stockholders   8,109
Total stockholders’ equity   8,358
Total liabilities and stockholders’ equity   22,742
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Trade accounts receivable and unbilled services, net   2,097
Total current assets   3,554
Deferred income taxes   109
Total assets   22,857
Unearned income   985
Total current liabilities   3,156
Deferred income taxes   895
Total liabilities   14,613
Retained earnings   538
Accumulated other comprehensive income   49
Equity attributable to IQVIA Holdings Inc.’s stockholders   7,995
Total stockholders’ equity   8,244
Total liabilities and stockholders’ equity   $ 22,857