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Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Change in Contract with Customer, Liability [Abstract] |  |  |
Beginning of period | [1] | $ 73 | $ 79
Additions to deferred revenue and customer advances |  | 162 | 103
Amount of deferred revenue and customer advances recognized in income |  | (155) | (110)
Ending of period | [2] | $ 80 | $ 72
[1] | Beginning deferred revenue and customer advances balances as of January 1, 2025 included $71 of current deferred revenue and customer advances and $2 of long-term deferred revenue. Beginning deferred revenue and customer advances balances as of January 1, 2024 included $77 of current deferred revenue and customer advances and $2 of long-term deferred revenue.
[2] | Ending deferred revenue and customer advances balances as of September 30, 2025 included $77 of current deferred revenue and customer advances and $3 of long-term deferred revenue. Ending deferred revenue and customer advances balances as of September 30, 2024 included $70 of current deferred revenue and customer advances and $2 of long-term deferred revenue.

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- Definition Contract with customer amount of deferred revenue and customer advances recognized + References No definition available. + Details
Name: | mksi_ContractWithCustomerAmountOfDeferredRevenueAndCustomerAdvancesRecognized
Namespace Prefix: | mksi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with customer liability additions. + References No definition available. + Details
Name: | mksi_ContractWithCustomerLiabilityAdditions
Namespace Prefix: | mksi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant