Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Income from operations	$ 579	$ 539
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	1,153	1,145
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Income from operations	381	400
Operating Segments [Member] | Health Care [Member]
Segment Reporting Information [Line Items]
Income from operations	321	337
Operating Segments [Member] | Products and Resources [Member]
Segment Reporting Information [Line Items]
Income from operations	261	234
Operating Segments [Member] | Communications, Media and Technology [Member]
Segment Reporting Information [Line Items]
Income from operations	190	174
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated costs	$ 574	$ 606