Purchase price of expected business acquisition prior to consideration being transferred. Excludes asset acquisition.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-7

+ Details

Name:	us-gaap_BusinessCombinationPriceOfAcquisitionExpected
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Combination, Price Per Share, Expected

+ References

No definition available.

+ Details

Name:	vrtx_BusinessCombinationPricePerShareExpected
Namespace Prefix:	vrtx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Consolidated leverage ratio that must be maintained in order to be in compliance with debt covenants.

+ References

No definition available.

+ Details

Name:	vrtx_DebtCovenantConsolidatedLeverageRatio
Namespace Prefix:	vrtx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant, Increase In Consolidated Leverage Ratio

+ References

No definition available.

+ Details

Name:	vrtx_DebtCovenantIncreaseInConsolidatedLeverageRatio
Namespace Prefix:	vrtx_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrtx_A2026TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrtx_A2026TermLoanTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrtx_A2026TermLoanTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=vrtx_A2026TermLoanTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=vrtx_CrineticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - Subsequent Event - USD ($)	Aug. 04, 2026	Jul. 30, 2026	Jul. 06, 2026
2026 Term Loan
Subsequent Event [Line Items]
Debt covenant, consolidated leverage ratio		3.50
Debt covenant, increase in consolidated leverage ratio		4.00
2026 Term Loan \| Line of Credit
Subsequent Event [Line Items]
Amount of credit agreement		$ 4,500,000,000
Proceeds from Issuance of Secured Debt	$ 0
2026 Term Loan, Tranche One \| Line of Credit
Subsequent Event [Line Items]
Debt instrument, due period		364 days
Amount payable		$ 1,000,000,000.0
2026 Term Loan, Tranche One \| Line of Credit \| Minimum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.00%
2026 Term Loan, Tranche One \| Line of Credit \| Minimum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.875%
2026 Term Loan, Tranche One \| Line of Credit \| Maximum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.50%
2026 Term Loan, Tranche One \| Line of Credit \| Maximum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.50%
2026 Term Loan, Tranche Two \| Line of Credit
Subsequent Event [Line Items]
Debt instrument, due period		2 years
Amount payable		$ 1,000,000,000.0
2026 Term Loan, Tranche Two \| Line of Credit \| Minimum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.00%
2026 Term Loan, Tranche Two \| Line of Credit \| Minimum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.875%
2026 Term Loan, Tranche Two \| Line of Credit \| Maximum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.50%
2026 Term Loan, Tranche Two \| Line of Credit \| Maximum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.50%
2026 Term Loan, Tranche Three \| Line of Credit
Subsequent Event [Line Items]
Debt instrument, due period		3 years
Amount payable		$ 2,500,000,000
2026 Term Loan, Tranche Three \| Line of Credit \| Minimum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.00%
2026 Term Loan, Tranche Three \| Line of Credit \| Minimum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.00%
2026 Term Loan, Tranche Three \| Line of Credit \| Maximum \| Base Rate
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		0.625%
2026 Term Loan, Tranche Three \| Line of Credit \| Maximum \| SOFR Loan
Subsequent Event [Line Items]
Basis spread on variable rate (as a percent)		1.625%
Bridge Loan
Subsequent Event [Line Items]
Debt instrument, due period			364 days
Crinetics
Subsequent Event [Line Items]
Business combination, price per share, expected			$ 85.00
Business combination, total equity value			$ 10,000,000,000.0