Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Income from operations	$ 729	$ 603	$ 2,094	$ 1,649
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	1,450	1,339	4,181	3,573
Operating Segments [Member] | Financial Services [Member]
Segment Reporting Information [Line Items]
Income from operations	463	463	1,308	1,209
Operating Segments [Member] | Healthcare Segment [Member]
Segment Reporting Information [Line Items]
Income from operations	383	378	1,182	1,004
Operating Segments [Member] | Products and Resources [Member]
Segment Reporting Information [Line Items]
Income from operations	351	307	988	805
Operating Segments [Member] | Communications, Media and Technology [Member]
Segment Reporting Information [Line Items]
Income from operations	253	191	703	555
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Unallocated costs	$ 721	$ 736	$ 2,087	$ 1,924