Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Information
Revenue	$ 16,331	$ 14,968	$ 47,849	$ 45,199
Cost	6,970	6,548	20,481	20,087
Other expense and (income)	6,931	9,222	21,184	22,621
Segment profit	2,430	(802)	6,185	2,491
Operating Segments
Segment Information
Revenue	16,292	14,900	47,782	44,985
Cost	6,619	6,247	19,542	19,260
Other expense and (income)	5,846	5,616	17,688	17,055
Segment profit	$ 3,827	$ 3,037	$ 10,552	$ 8,670
Revenue year-to-year change (as a percent)	9.30%		6.20%
Segment profit year-to-year change (as a percent)	26.00%		21.70%
Segment profit margin (as a percent)	23.50%	20.40%	22.10%	19.30%
Operating Segments | Software
Segment Information
Revenue	$ 7,209	$ 6,524	$ 20,932	$ 19,162
Cost	1,220	1,093	3,452	3,237
Other expense and (income)	3,615	3,462	10,962	10,343
Segment profit	$ 2,374	$ 1,969	$ 6,517	$ 5,582
Revenue year-to-year change (as a percent)	10.50%		9.20%
Segment profit year-to-year change (as a percent)	20.50%		16.80%
Segment profit margin (as a percent)	32.90%	30.20%	31.10%	29.10%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,324	$ 5,152	$ 15,706	$ 15,517
Cost	3,766	3,688	11,306	11,377
Other expense and (income)	872	905	2,594	2,693
Segment profit	$ 686	$ 559	$ 1,807	$ 1,447
Revenue year-to-year change (as a percent)	3.30%		1.20%
Segment profit year-to-year change (as a percent)	22.60%		24.80%
Segment profit margin (as a percent)	12.90%	10.90%	11.50%	9.30%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,559	$ 3,042	$ 10,586	$ 9,764
Cost	1,525	1,370	4,481	4,365
Other expense and (income)	1,390	1,250	4,248	4,011
Segment profit	$ 644	$ 422	$ 1,857	$ 1,387
Revenue year-to-year change (as a percent)	17.00%		8.40%
Segment profit year-to-year change (as a percent)	52.60%		33.90%
Segment profit margin (as a percent)	18.10%	13.90%	17.50%	14.20%
Operating Segments | Financing
Segment Information
Revenue	$ 200	$ 181	$ 557	$ 543
Cost	109	96	303	281
Other expense and (income)	(32)	(1)	(116)	7
Segment profit	$ 123	$ 86	$ 371	$ 254
Revenue year-to-year change (as a percent)	10.40%		2.70%
Segment profit year-to-year change (as a percent)	43.20%		45.80%
Segment profit margin (as a percent)	61.60%	47.50%	66.50%	46.90%