Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Information
Number Of Reportable Segments Not Disclosed Flag			segments
Revenue	$ 17,103	$ 16,331	$ 50,182	$ 47,849
Cost	7,389	6,970	21,611	20,481
Other expense and (income)	7,217	6,931	22,208	21,184
Segment profit	2,497	2,430	6,363	6,185
Operating Segments
Segment Information
Revenue	17,038	16,292	50,017	47,782
Cost	6,958	6,619	20,398	19,542
Other expense and (income)	5,871	5,846	18,018	17,688
Segment profit	$ 4,209	$ 3,827	$ 11,601	$ 10,552
Revenue year-to-year change (as a percent)	4.60%		4.70%
Segment profit year-to-year change (as a percent)	10.00%		9.90%
Segment profit margin (as a percent)	24.70%	23.50%	23.20%	22.10%
Operating Segments | Software
Segment Information
Revenue	$ 7,804	$ 7,209	$ 22,617	$ 20,932
Cost	1,368	1,220	3,934	3,452
Other expense and (income)	3,702	3,615	11,348	10,962
Segment profit	$ 2,734	$ 2,374	$ 7,335	$ 6,517
Revenue year-to-year change (as a percent)	8.20%		8.10%
Segment profit year-to-year change (as a percent)	15.20%		12.50%
Segment profit margin (as a percent)	35.00%	32.90%	32.40%	31.10%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,335	$ 5,324	$ 15,934	$ 15,706
Cost	3,873	3,766	11,484	11,306
Other expense and (income)	810	872	2,593	2,594
Segment profit	$ 653	$ 686	$ 1,858	$ 1,807
Revenue year-to-year change (as a percent)	0.20%		1.50%
Segment profit year-to-year change (as a percent)	(4.80%)		2.80%
Segment profit margin (as a percent)	12.20%	12.90%	11.70%	11.50%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,707	$ 3,559	$ 10,868	$ 10,586
Cost	1,603	1,525	4,634	4,481
Other expense and (income)	1,389	1,390	4,159	4,248
Segment profit	$ 715	$ 644	$ 2,074	$ 1,857
Revenue year-to-year change (as a percent)	4.20%		2.70%
Segment profit year-to-year change (as a percent)	10.90%		11.70%
Segment profit margin (as a percent)	19.30%	18.10%	19.10%	17.50%
Operating Segments | Financing
Segment Information
Revenue	$ 192	$ 200	$ 598	$ 557
Cost	114	109	345	303
Other expense and (income)	(29)	(32)	(81)	(116)
Segment profit	$ 108	$ 123	$ 334	$ 371
Revenue year-to-year change (as a percent)	(3.90%)		7.30%
Segment profit year-to-year change (as a percent)	(12.50%)		(9.90%)
Segment profit margin (as a percent)	56.10%	61.60%	55.90%	66.50%