Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 19,736	$ 19,353	$ 19,428
Income from operations	2,892	2,689	2,968
Health Sciences
Segment Reporting Information [Line Items]
Revenues	5,932	5,674	5,631
Financial Services
Segment Reporting Information [Line Items]
Revenues	5,753	5,809	6,072
Products and Resources
Segment Reporting Information [Line Items]
Revenues	4,782	4,628	4,566
Communications, Media and Technology
Segment Reporting Information [Line Items]
Revenues	3,269	3,242	3,159
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	19,736	19,353	19,428
Less: other segment items	15,580	15,236	15,075
Income from operations	4,156	4,117	4,353
Operating Segments [Member] | Health Sciences
Segment Reporting Information [Line Items]
Revenues	5,932	5,674	5,631
Less: other segment items	4,599	4,322	4,441
Income from operations	1,333	1,352	1,190
Operating Segments [Member] | Financial Services
Segment Reporting Information [Line Items]
Revenues	5,753	5,809	6,072
Less: other segment items	4,512	4,653	4,749
Income from operations	1,241	1,156	1,323
Operating Segments [Member] | Products and Resources
Segment Reporting Information [Line Items]
Revenues	4,782	4,628	4,566
Less: other segment items	3,802	3,644	3,495
Income from operations	980	984	1,071
Operating Segments [Member] | Communications, Media and Technology
Segment Reporting Information [Line Items]
Revenues	3,269	3,242	3,159
Less: other segment items	2,667	2,617	2,390
Income from operations	602	625	769
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Segment Reporting Information [Line Items]
Less: unallocated costs	$ 1,264	$ 1,428	$ 1,385