Segments - Results of Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Information
Revenue	$ 14,968	$ 14,752	$ 45,199	$ 44,479
Segment profit	(802)	1,873	2,491	4,931
Operating Segments
Segment Information
Revenue	14,900	14,582	44,985	43,988
Segment profit	$ 3,037	$ 2,869	$ 8,670	$ 8,110
Revenue year-to-year change (as a percent)	2.20%		2.30%
Segment profit year-to-year change (as a percent)	5.80%		6.90%
Segment profit margin (as a percent)	20.40%	19.70%	19.30%	18.40%
Operating Segments | Software
Segment Information
Revenue	$ 6,524	$ 5,947	$ 19,162	$ 17,832
Segment profit	$ 1,969	$ 1,722	$ 5,582	$ 4,850
Revenue year-to-year change (as a percent)	9.70%		7.50%
Segment profit year-to-year change (as a percent)	14.40%		15.10%
Segment profit margin (as a percent)	30.20%	29.00%	29.10%	27.20%
Operating Segments | Consulting
Segment Information
Revenue	$ 5,152	$ 5,178	$ 15,517	$ 15,601
Segment profit	$ 559	$ 566	$ 1,447	$ 1,476
Revenue year-to-year change (as a percent)	(0.50%)		(0.50%)
Segment profit year-to-year change (as a percent)	(1.20%)		(1.90%)
Segment profit margin (as a percent)	10.90%	10.90%	9.30%	9.50%
Operating Segments | Infrastructure
Segment Information
Revenue	$ 3,042	$ 3,272	$ 9,764	$ 9,988
Segment profit	$ 422	$ 490	$ 1,387	$ 1,529
Revenue year-to-year change (as a percent)	(7.00%)		(2.30%)
Segment profit year-to-year change (as a percent)	(13.80%)		(9.30%)
Segment profit margin (as a percent)	13.90%	15.00%	14.20%	15.30%
Operating Segments | Financing
Segment Information
Revenue	$ 181	$ 186	$ 543	$ 566
Segment profit	$ 86	$ 91	$ 254	$ 256
Revenue year-to-year change (as a percent)	(2.50%)		(4.10%)
Segment profit year-to-year change (as a percent)	(5.90%)		(0.50%)
Segment profit margin (as a percent)	47.50%	49.20%	46.90%	45.20%