Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Information
Revenue	$ 14,541	$ 14,462
Cost	6,510	6,719
Other expense and (income)	6,873	6,669
Segment profit	1,158	1,074
Operating Segments
Segment Information
Revenue	14,480	14,354
Cost	6,195	6,421
Other expense and (income)	5,564	5,606
Segment profit	$ 2,721	$ 2,327
Revenue year-to-year change (as a percent)	0.90%
Segment profit year-to-year change (as a percent)	17.00%
Segment profit margin (as a percent)	18.80%	16.20%
Operating Segments | Software
Segment Information
Revenue	$ 6,336	$ 5,899
Cost	1,042	1,039
Other expense and (income)	3,447	3,360
Segment profit	$ 1,847	$ 1,500
Revenue year-to-year change (as a percent)	7.40%
Segment profit year-to-year change (as a percent)	23.20%
Segment profit margin (as a percent)	29.10%	25.40%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,068	$ 5,186
Cost	3,686	3,872
Other expense and (income)	823	889
Segment profit	$ 558	$ 424
Revenue year-to-year change (as a percent)	(2.30%)
Segment profit year-to-year change (as a percent)	31.60%
Segment profit margin (as a percent)	11.00%	8.20%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 2,886	$ 3,076
Cost	1,363	1,410
Other expense and (income)	1,275	1,355
Segment profit	$ 248	$ 311
Revenue year-to-year change (as a percent)	(6.20%)
Segment profit year-to-year change (as a percent)	(20.30%)
Segment profit margin (as a percent)	8.60%	10.10%
Operating Segments | Financing
Segment Information
Revenue	$ 191	$ 193
Cost	104	99
Other expense and (income)	19	2
Segment profit	$ 69	$ 92
Revenue year-to-year change (as a percent)	(0.80%)
Segment profit year-to-year change (as a percent)	(25.50%)
Segment profit margin (as a percent)	35.80%	47.70%