Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Information
Revenue	$ 15,475	$ 15,535	$ 29,727	$ 29,732
Pre-tax income from continuing operations	2,000	1,722	3,058	2,345
Operating Segments
Segment Information
Revenue	15,424	15,355	29,601	29,328
Pre-tax income from continuing operations	$ 2,647	$ 2,577	$ 4,510	$ 4,342
Revenue year-to-year change (as a percent)	0.40%		0.90%
Pre-tax income year-to-year change (as a percent)	2.70%		3.80%
Pre-tax income margin (as a percent)	17.20%	16.80%	15.20%	14.80%
Operating Segments | Software
Segment Information
Revenue	$ 6,608	$ 6,166	$ 12,529	$ 11,938
Pre-tax income from continuing operations	$ 1,504	$ 1,375	$ 2,668	$ 2,509
Revenue year-to-year change (as a percent)	7.20%		5.00%
Pre-tax income year-to-year change (as a percent)	9.40%		6.30%
Pre-tax income margin (as a percent)	22.80%	22.30%	21.30%	21.00%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,013	$ 4,809	$ 9,975	$ 9,637
Pre-tax income from continuing operations	$ 446	$ 343	$ 828	$ 691
Revenue year-to-year change (as a percent)	4.30%		3.50%
Pre-tax income year-to-year change (as a percent)	30.10%		19.80%
Pre-tax income margin (as a percent)	8.90%	7.10%	8.30%	7.20%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,618	$ 4,235	$ 6,716	$ 7,453
Pre-tax income from continuing operations	$ 633	$ 757	$ 849	$ 956
Revenue year-to-year change (as a percent)	(14.60%)		(9.90%)
Pre-tax income year-to-year change (as a percent)	(16.40%)		(11.20%)
Pre-tax income margin (as a percent)	17.50%	17.90%	12.60%	12.80%
Operating Segments | Financing
Segment Information
Revenue	$ 185	$ 146	$ 380	$ 300
Pre-tax income from continuing operations	$ 64	$ 102	$ 165	$ 186
Revenue year-to-year change (as a percent)	26.20%		26.80%
Pre-tax income year-to-year change (as a percent)	(36.80%)		(11.30%)
Pre-tax income margin (as a percent)	34.90%	69.70%	43.30%	62.00%