Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Information
Revenue	$ 14,752	$ 14,107	$ 44,479	$ 43,840
Pre-tax income from continuing operations	1,873	(4,501)	4,931	(2,156)
Operating Segments
Segment Information
Revenue	14,685	14,037	44,287	43,365
Pre-tax income from continuing operations	$ 2,473	$ 2,128	$ 6,983	$ 6,470
Revenue year-to-year change (as a percent)	4.60%		2.10%
Pre-tax income year-to-year change (as a percent)	16.20%		7.90%
Pre-tax income margin (as a percent)	16.80%	15.20%	15.80%	14.90%
Operating Segments | Software
Segment Information
Revenue	$ 6,265	$ 5,811	$ 18,794	$ 17,749
Pre-tax income from continuing operations	$ 1,486	$ 1,306	$ 4,154	$ 3,816
Revenue year-to-year change (as a percent)	7.80%		5.90%
Pre-tax income year-to-year change (as a percent)	13.70%		8.90%
Pre-tax income margin (as a percent)	23.70%	22.50%	22.10%	21.50%
Operating Segments | Consulting
Segment Information
Revenue	$ 4,963	$ 4,700	$ 14,938	$ 14,337
Pre-tax income from continuing operations	$ 509	$ 462	$ 1,336	$ 1,154
Revenue year-to-year change (as a percent)	5.60%		4.20%
Pre-tax income year-to-year change (as a percent)	10.00%		15.80%
Pre-tax income margin (as a percent)	10.20%	9.80%	8.90%	8.00%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,272	$ 3,352	$ 9,988	$ 10,805
Pre-tax income from continuing operations	$ 387	$ 280	$ 1,236	$ 1,236
Revenue year-to-year change (as a percent)	(2.40%)		(7.60%)
Pre-tax income year-to-year change (as a percent)	38.30%		(0.00%)
Pre-tax income margin (as a percent)	11.80%	8.30%	12.40%	11.40%
Operating Segments | Financing
Segment Information
Revenue	$ 186	$ 174	$ 566	$ 474
Pre-tax income from continuing operations	$ 91	$ 79	$ 256	$ 265
Revenue year-to-year change (as a percent)	6.90%		19.50%
Pre-tax income year-to-year change (as a percent)	16.00%		(3.20%)
Pre-tax income margin (as a percent)	49.20%	45.40%	45.30%	55.90%