Average floating rate.

No definition available.

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Namespace Prefix:	iqv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
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-Section S45
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-Publisher FASB
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-Publisher FASB
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-Section 50
-Paragraph 4
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
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+ Details

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

- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
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+ Details

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Credit Arrangements - Summary of Debt (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2026	Mar. 16, 2026	Dec. 31, 2025	Mar. 10, 2025
Senior Secured Credit Facilities:
Principal amount of debt	$ 16,172		$ 15,800
Less: unamortized discount and debt issuance costs	(105)		(76)
Less: current portion	(1,244)		(1,840)
Long-term debt	14,823		13,884
U.S Dollars \| Senior Secured Term A Loan, 6.69%
Senior Secured Credit Facilities:
Principal amount of debt	$ 2,081		2,162
U.S Dollars \| Senior Secured Term A Loan, 6.69% \| SOFR
Senior Secured Credit Facilities:
Average floating rate	5.32%
U.S Dollars \| Senior Notes Due 2030, 6.500% \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 500		500
Rate	6.50%
U.S Dollars \| Senior Notes Due 2032, 6.25% \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 2,000		2,000
Rate	6.25%
U.S Dollars \| Senior Notes Due 2034, 6.375% \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 2,000		0
Rate	6.375%
U.S Dollars \| Term Loan \| SOFR
Senior Secured Credit Facilities:
Principal amount of debt	$ 440		440
U.S Dollars \| Due in 2024 \| Receivable Financing Facilities \| SOFR
Senior Secured Credit Facilities:
Average floating rate	4.90%
U.S Dollars \| Due in 2026 \| 5.0% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 0		1,050
Rate	5.00%
U.S Dollars \| Due in 2027 \| 5.0% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 1,100		1,100
Rate	5.00%
U.S Dollars \| Due in 2028 \| Senior Secured Notes Due 2028, 5.700% \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 750		750
Rate	5.70%
U.S Dollars \| Due in 2029 \| Senior Secured Notes Due 2029, 5.625% \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 1,250		1,250
Rate	6.25%
U.S Dollars \| Due in 2031 \| Senior Secured Term B Loan, 7.31% \| SOFR
Senior Secured Credit Facilities:
Principal amount of debt	$ 1,950		1,965
Average floating rate	5.82%
U.S Dollars \| Due in 2031 \| Senior Secured Term B Loan, 6.02%
Senior Secured Credit Facilities:
Principal amount of debt				$ 650
EUR Dollars \| Due in 2025 \| 2.875% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 1,077		0
Rate	4.625%
EUR Dollars \| Due in 2026 \| Senior Secured Term A Loan, 5.15% \| Euribor Rate
Senior Secured Credit Facilities:
Principal amount of debt	$ 269		290
Average floating rate	3.84%
EUR Dollars \| Due in 2026 \| 1.75% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 0	$ 550	646
Rate	1.75%	1.75%
EUR Dollars \| Due in 2028 \| 2.875% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 807		835
Rate	2.875%
EUR Dollars \| Due in 2028 \| 2.25% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 817		845
Rate	2.25%
EUR Dollars \| Due in 2029 \| 2.25% Senior Notes \| Senior Notes
Senior Secured Credit Facilities:
Principal amount of debt	$ 1,021		1,057
Rate	2.25%
Revolving Credit Facility \| U.S Dollars
Senior Secured Credit Facilities:
Principal amount of debt	$ 0		800
Revolving Credit Facility \| U.S Dollars \| SOFR
Senior Secured Credit Facilities:
Average floating rate	0.00%
Revolving Credit Facility \| U.S Dollars \| Revolving Loan Commitment \| SOFR
Senior Secured Credit Facilities:
Principal amount of debt	$ 110		$ 110