Revenues and Trade Accounts Receivable - Remaining Performance Obligations Narrative (Details) $ in Millions	Sep. 30, 2025 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, remaining performance obligation	$ 6,218
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 \| Revenue Remaining Performance Obligation Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 \| Revenue Remaining Performance Obligation Period One
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	35.00%
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 \| Revenue Remaining Performance Obligation Period Two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	60.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 \| Revenue Remaining Performance Obligation Period Three
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	95.00%
Revenue, remaining performance obligation, period	5 years

COGNIZANT TECHNOLOGY SOLUTIONS CORP 10-Q