Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Information
Number Of Reportable Segments Not Disclosed Flag	segments
Revenue	$ 15,917	$ 14,541
Cost	6,968	6,510
Other expense and (income)	7,562	6,873
Segment profit	1,387	1,158
Operating Segments
Segment Information
Revenue	15,870	14,480
Cost	6,598	6,195
Other expense and (income)	5,971	5,564
Segment profit	$ 3,300	$ 2,721
Revenue year-to-year change (as a percent)	9.60%
Segment profit year-to-year change (as a percent)	21.30%
Segment profit margin (as a percent)	20.80%	18.80%
Operating Segments | Software
Segment Information
Revenue	$ 7,052	$ 6,336
Cost	1,216	1,042
Other expense and (income)	3,737	3,447
Segment profit	$ 2,099	$ 1,847
Revenue year-to-year change (as a percent)	11.30%
Segment profit year-to-year change (as a percent)	13.70%
Segment profit margin (as a percent)	29.80%	29.10%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,272	$ 5,068
Cost	3,822	3,686
Other expense and (income)	891	823
Segment profit	$ 558	$ 558
Revenue year-to-year change (as a percent)	4.00%
Segment profit year-to-year change (as a percent)	(0.10%)
Segment profit margin (as a percent)	10.60%	11.00%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,326	$ 2,886
Cost	1,435	1,363
Other expense and (income)	1,366	1,275
Segment profit	$ 524	$ 248
Revenue year-to-year change (as a percent)	15.30%
Segment profit year-to-year change (as a percent)	111.70%
Segment profit margin (as a percent)	15.80%	8.60%
Operating Segments | Financing
Segment Information
Revenue	$ 220	$ 191
Cost	124	104
Other expense and (income)	(23)	19
Segment profit	$ 118	$ 69
Revenue year-to-year change (as a percent)	14.80%
Segment profit year-to-year change (as a percent)	72.60%
Segment profit margin (as a percent)	53.80%	35.80%