Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Information
Revenue	$ 14,252	$ 14,197
Pre-tax income from continuing operations	1,058	623
Business Segments
Segment Information
Revenue	14,177	13,973
Pre-tax income from continuing operations	$ 1,863	$ 1,766
Revenue year-to-year change (as a percent)	1.50%
Pre-tax income year-to-year change (as a percent)	5.50%
Pre-tax income margin (as a percent)	13.10%	12.60%
Business Segments | Software
Segment Information
Revenue	$ 5,921	$ 5,772
Pre-tax income from continuing operations	$ 1,164	$ 1,134
Revenue year-to-year change (as a percent)	2.60%
Pre-tax income year-to-year change (as a percent)	2.70%
Pre-tax income margin (as a percent)	19.70%	19.70%
Business Segments | Consulting
Segment Information
Revenue	$ 4,962	$ 4,829
Pre-tax income from continuing operations	$ 382	$ 348
Revenue year-to-year change (as a percent)	2.80%
Pre-tax income year-to-year change (as a percent)	9.60%
Pre-tax income margin (as a percent)	7.70%	7.20%
Business Segments | Infrastructure
Segment Information
Revenue	$ 3,098	$ 3,219
Pre-tax income from continuing operations	$ 216	$ 199
Revenue year-to-year change (as a percent)	(3.70%)
Pre-tax income year-to-year change (as a percent)	8.50%
Pre-tax income margin (as a percent)	7.00%	6.20%
Business Segments | Financing
Segment Information
Revenue	$ 196	$ 154
Pre-tax income from continuing operations	$ 100	$ 84
Revenue year-to-year change (as a percent)	27.30%
Pre-tax income year-to-year change (as a percent)	19.60%
Pre-tax income margin (as a percent)	51.30%	54.60%