Goodwill and Intangible Assets, net (Schedule Of Goodwill Allocation By Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 2,554	$ 2,405
Additions	123	157
Foreign currency translation adjustments	27	(8)
Goodwill, Ending Balance	2,704	2,554
Financial Services
Goodwill [Roll Forward]
Goodwill, Beginning Balance	227	203
Additions	27	28
Foreign currency translation adjustments	11	(4)
Goodwill, Ending Balance	265	227
Healthcare
Goodwill [Roll Forward]
Goodwill, Beginning Balance	2,089	2,076
Additions	13	14
Foreign currency translation adjustments	4	(1)
Goodwill, Ending Balance	2,106	2,089
Products and Resources
Goodwill [Roll Forward]
Goodwill, Beginning Balance	159	67
Additions	72	94
Foreign currency translation adjustments	9	(2)
Goodwill, Ending Balance	240	159
Communications, Media and Technology
Goodwill [Roll Forward]
Goodwill, Beginning Balance	79	59
Additions	11	21
Foreign currency translation adjustments	3	(1)
Goodwill, Ending Balance	$ 93	$ 79