v3.25.2

Fair Value Measurements - Changes in Level 3 Financial Assets and Liabilities Measured on Recurring Basis (Detail) - Contingent consideration $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning balance	$ 102
Business combinations	20
Contingent consideration paid	(16)
Revaluations included in earnings and foreign currency translation adjustments	(1)
Ending balance	$ 105

Fair value measurement with unobservable inputs reconciliation recurring basis liability business combinations.

+ References

No definition available.

+ Details

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Namespace Prefix:	iqv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability contingent consideration paid.

+ References

No definition available.

+ Details

Name:	iqv_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityContingentConsiderationPaid
Namespace Prefix:	iqv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability gain loss included in earnings and foreign currency translation adjustments.

+ References

No definition available.

+ Details

Name:	iqv_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsAndForeignCurrencyTranslationAdjustments
Namespace Prefix:	iqv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=iqv_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

IQVIA HOLDINGS INC. 10-Q