Business Acquisition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 28, 2019
AbleVets, LLC. [Member]
Business Acquisition [Line Items]
Business Acquisition, Description of Acquired Entity			AbleVets is a health IT engineering and consulting company specializing in cybersecurity, cloud and system development solutions for federal organizations.
Business Combination, Reason for Business Combination			We believe this acquisition enhanced our resource capabilities and growth opportunities within our federal business.
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			8 years
Business Combination, Consideration Transferred			$ 76
Business Acquisition, Effective Date of Acquisition			Oct. 25, 2019
Business Acquisition, Name of Acquired Entity			AbleVets, LLC
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			8 years
Business Acquisition, Effective Date of Acquisition			Oct. 25, 2019
Business Acquisition, Name of Acquired Entity			AbleVets, LLC
Business Acquisition, Description of Acquired Entity			AbleVets is a health IT engineering and consulting company specializing in cybersecurity, cloud and system development solutions for federal organizations.
Business Combination, Reason for Business Combination			We believe this acquisition enhanced our resource capabilities and growth opportunities within our federal business.
Business Combination, Consideration Transferred			$ 76
2020 Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		8 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		8 years
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 4
Kantar Health
Business Acquisition [Line Items]
Business Acquisition, Description of Acquired Entity	we acquired Kantar Health, a division of Kantar Group. Kantar Health provides data, analytics, commercial research, and consulting services to the life sciences industry.
Business Combination, Reason for Business Combination	We believe this acquisition complements our existing Data-as-a-Service efforts as it provides a meaningful entry into the pharmaceutical market through Kantar Health's existing clients and their leadership team with important industry experience and relationships.
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 170
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Business Combination, Consideration Transferred	$ 375
Business Acquisition, Effective Date of Acquisition	Apr. 01, 2021
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 170
Business Acquisition, Effective Date of Acquisition	Apr. 01, 2021
Business Acquisition, Description of Acquired Entity	we acquired Kantar Health, a division of Kantar Group. Kantar Health provides data, analytics, commercial research, and consulting services to the life sciences industry.
Business Combination, Reason for Business Combination	We believe this acquisition complements our existing Data-as-a-Service efforts as it provides a meaningful entry into the pharmaceutical market through Kantar Health's existing clients and their leadership team with important industry experience and relationships.
Business Combination, Consideration Transferred	$ 375
April 2020 Acquisition
Business Acquisition [Line Items]
Business Acquisition, Description of Acquired Entity		consulting company specializing in providing cybersecurity solutions to clients in the healthcare industry
Business Combination, Reason for Business Combination		We believe this acquisition enhanced our resource capabilities and growth opportunities for our cybersecurity solution offerings
Business Combination, Consideration Transferred		$ 34
Business Acquisition, Effective Date of Acquisition		Apr. 01, 2020
Business Acquisition, Effective Date of Acquisition		Apr. 01, 2020
Business Acquisition, Description of Acquired Entity		consulting company specializing in providing cybersecurity solutions to clients in the healthcare industry
Business Combination, Reason for Business Combination		We believe this acquisition enhanced our resource capabilities and growth opportunities for our cybersecurity solution offerings
Business Combination, Consideration Transferred		$ 34
October 2020 Acquisition
Business Acquisition [Line Items]
Business Acquisition, Description of Acquired Entity		software company that offered a patient referral management solution to clients within the healthcare industry
Business Combination, Reason for Business Combination		We believe this acquisition enhanced our portfolio of offerings on our HealtheIntent platform
Business Combination, Consideration Transferred		$ 15
Business Acquisition, Effective Date of Acquisition		Oct. 19, 2020
Business Acquisition, Effective Date of Acquisition		Oct. 19, 2020
Business Acquisition, Description of Acquired Entity		software company that offered a patient referral management solution to clients within the healthcare industry
Business Combination, Reason for Business Combination		We believe this acquisition enhanced our portfolio of offerings on our HealtheIntent platform
Business Combination, Consideration Transferred		$ 15