Revenue Recognition - Disaggregation of Revenue by Major Products and Service Offerings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue by Major Products/Service Offerings
Total Revenue	$ 14,252	$ 14,197
Business Segments
Revenue by Major Products/Service Offerings
Total Revenue	14,177	13,973
Other
Revenue by Major Products/Service Offerings
Revenue	75	224
Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	5,921	5,772
Total Revenue	5,921	5,772
Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	4,962	4,829
Total Revenue	4,962	4,829
Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	3,098	3,219
Total Revenue	3,098	3,219
Financing | Business Segments
Revenue by Major Products/Service Offerings
Financial Services Revenue	196	154
Total Revenue	196	154
Hybrid Platform & Solutions | Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	4,179	4,080
Transaction Processing | Software | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,742	1,692
Business Transformation | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	2,283	2,255
Application Operations | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,736	1,619
Technology Consulting | Consulting | Business Segments
Revenue by Major Products/Service Offerings
Revenue	943	955
Hybrid Infrastructure | Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	1,709	1,700
Infrastructure Support | Infrastructure | Business Segments
Revenue by Major Products/Service Offerings
Revenue	$ 1,389	$ 1,519