Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Information
Number Of Reportable Segments Not Disclosed Flag			segments
Revenue	$ 17,162	$ 16,977	$ 33,079	$ 31,519
Cost	7,255	7,001	14,222	13,511
Other expense and (income)	7,428	7,380	14,991	14,253
Segment profit	2,479	2,597	3,866	3,755
Operating Segments
Segment Information
Revenue	17,110	17,009	32,979	31,489
Cost	6,841	6,727	13,440	12,923
Other expense and (income)	6,176	6,278	12,148	11,842
Segment profit	$ 4,092	$ 4,003	$ 7,392	$ 6,725
Revenue year-to-year change (as a percent)	0.60%		4.70%
Segment profit year-to-year change (as a percent)	2.20%		9.90%
Segment profit margin (as a percent)	23.90%	23.50%	22.40%	21.40%
Operating Segments | Software
Segment Information
Revenue	$ 7,761	$ 7,387	$ 14,813	$ 13,722
Cost	1,350	1,190	2,566	2,232
Other expense and (income)	3,910	3,900	7,646	7,347
Segment profit	$ 2,502	$ 2,296	$ 4,601	$ 4,143
Revenue year-to-year change (as a percent)	5.10%		7.90%
Segment profit year-to-year change (as a percent)	8.90%		11.10%
Segment profit margin (as a percent)	32.20%	31.10%	31.10%	30.20%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,327	$ 5,314	$ 10,599	$ 10,382
Cost	3,789	3,854	7,611	7,540
Other expense and (income)	892	898	1,783	1,721
Segment profit	$ 647	$ 562	$ 1,205	$ 1,121
Revenue year-to-year change (as a percent)	0.20%		2.10%
Segment profit year-to-year change (as a percent)	15.10%		7.50%
Segment profit margin (as a percent)	12.10%	10.60%	11.40%	10.80%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,835	$ 4,142	$ 7,161	$ 7,027
Cost	1,596	1,593	3,031	2,957
Other expense and (income)	1,404	1,583	2,770	2,858
Segment profit	$ 835	$ 965	$ 1,360	$ 1,213
Revenue year-to-year change (as a percent)	(7.40%)		1.90%
Segment profit year-to-year change (as a percent)	(13.40%)		12.10%
Segment profit margin (as a percent)	21.80%	23.30%	19.00%	17.30%
Operating Segments | Financing
Segment Information
Revenue	$ 186	$ 166	$ 406	$ 357
Cost	107	90	232	194
Other expense and (income)	(29)	(103)	(52)	(84)
Segment profit	$ 108	$ 179	$ 226	$ 248
Revenue year-to-year change (as a percent)	12.20%		13.60%
Segment profit year-to-year change (as a percent)	(39.70%)		(8.60%)
Segment profit margin (as a percent)	58.00%	107.90%	55.80%	69.30%