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Revenues and Trade Accounts Receivable - Capitalized Costs to Fulfill Contract with Customer (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Capitalized Contract Cost, Net [Roll Forward] |  |
Beginning balance | $ 245 | $ 265
Amortization expense | 69 | 64
Costs capitalized | 43 | 41
Ending balance | $ 219 | $ 242

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- Definition Capitalized Contract Cost, Costs Capitalized + References No definition available. + Details
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Namespace Prefix: | ctsh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Capitalized Contract Cost, Net + References No definition available. + Details
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Namespace Prefix: | ctsh_
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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