Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Information
Revenue	$ 14,197	$ 13,187	[1]
Pre-tax income from continuing operations	623	244	[1]
Business Segments
Segment Information
Revenue	13,973	12,902
Pre-tax income from continuing operations	$ 1,766	$ 1,325
Revenue year-to-year change (as a percent)	8.30%
Pre-tax income year-to-year change (as a percent)	33.30%
Pre-tax income margin (as a percent)	12.60%	10.30%
Business Segments | Software
Segment Information
Revenue	$ 5,772	$ 5,138
Pre-tax income from continuing operations	$ 1,134	$ 658
Revenue year-to-year change (as a percent)	12.30%
Pre-tax income year-to-year change (as a percent)	72.30%
Pre-tax income margin (as a percent)	19.70%	12.80%
Business Segments | Consulting
Segment Information
Revenue	$ 4,829	$ 4,262
Pre-tax income from continuing operations	$ 348	$ 277
Revenue year-to-year change (as a percent)	13.30%
Pre-tax income year-to-year change (as a percent)	25.80%
Pre-tax income margin (as a percent)	7.20%	6.50%
Business Segments | Infrastructure
Segment Information
Revenue	$ 3,219	$ 3,293
Pre-tax income from continuing operations	$ 199	$ 292
Revenue year-to-year change (as a percent)	(2.30%)
Pre-tax income year-to-year change (as a percent)	(31.70%)
Pre-tax income margin (as a percent)	6.20%	8.90%
Business Segments | Financing
Segment Information
Revenue	$ 154	$ 208
Pre-tax income from continuing operations	$ 84	$ 98
Revenue year-to-year change (as a percent)	(26.20%)
Pre-tax income year-to-year change (as a percent)	(14.30%)
Pre-tax income margin (as a percent)	54.60%	47.00%

[1] Reclassified to reflect discontinued operations presentation.