Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Information
Revenue	$ 14,462	$ 14,252
Segment profit	1,074	1,058
Operating Segments
Segment Information
Revenue	14,354	14,083
Segment profit	$ 2,327	$ 2,213
Revenue year-to-year change (as a percent)	1.90%
Pre-tax income year-to-year change (as a percent)	5.20%
Pre-tax income margin (as a percent)	16.20%	15.70%
Operating Segments | Software
Segment Information
Revenue	$ 5,899	$ 5,591
Segment profit	$ 1,500	$ 1,379
Revenue year-to-year change (as a percent)	5.50%
Pre-tax income year-to-year change (as a percent)	8.80%
Pre-tax income margin (as a percent)	25.40%	24.70%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,186	$ 5,197
Segment profit	$ 424	$ 427
Revenue year-to-year change (as a percent)	(0.20%)
Pre-tax income year-to-year change (as a percent)	(0.60%)
Pre-tax income margin (as a percent)	8.20%	8.20%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,076	$ 3,098
Segment profit	$ 311	$ 307
Revenue year-to-year change (as a percent)	(0.70%)
Pre-tax income year-to-year change (as a percent)	1.40%
Pre-tax income margin (as a percent)	10.10%	9.90%
Operating Segments | Financing
Segment Information
Revenue	$ 193	$ 196
Segment profit	$ 92	$ 100
Revenue year-to-year change (as a percent)	(1.60%)
Pre-tax income year-to-year change (as a percent)	(8.40%)
Pre-tax income margin (as a percent)	47.70%	51.20%