Revenue Recognition - Disaggregation of Revenue by Major Products and Service Offerings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue by Major Products/Service Offerings
Total Revenue	$ 14,197	$ 13,187	[1]
Business Segments
Revenue by Major Products/Service Offerings
Total Revenue	13,973	12,902
Other
Revenue by Major Products/Service Offerings
Revenue	224	284
Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	5,772	5,138
Total Revenue	5,772	5,138
Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	4,829	4,262
Total Revenue	4,829	4,262
Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	3,219	3,293
Total Revenue	3,219	3,293
Financing | Business Segments
Revenue by Major Products/Service Offerings
Financial Services Revenue	154	208
Total Revenue	154	208
Hybrid Platform & Solutions | Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	4,080	3,800
Transaction Processing | Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,692	1,338
Business Transformation | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	2,255	1,953
Technology Consulting | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	955	835
Application Operations | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,619	1,474
Hybrid Infrastructure | Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,700	1,782
Infrastructure Support | Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	$ 1,519	$ 1,512

[1] Reclassified to reflect discontinued operations presentation.