Revenue Recognition - Disaggregation of Revenue by Major Products and Service Offerings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue by Major Products/Service Offerings
Total Revenue	$ 15,475	$ 15,535	$ 29,727	$ 29,732
Operating Segments
Revenue by Major Products/Service Offerings
Total Revenue	15,424	15,355	29,601	29,328
Other
Revenue by Major Products/Service Offerings
Revenue	51	180	126	404
Software | Operating Segments
Revenue by Major Products/Service Offerings
Total Revenue	6,608	6,166	12,529	11,938
Consulting | Operating Segments
Revenue by Major Products/Service Offerings
Total Revenue	5,013	4,809	9,975	9,637
Infrastructure | Operating Segments
Revenue by Major Products/Service Offerings
Total Revenue	3,618	4,235	6,716	7,453
Financing | Operating Segments
Revenue by Major Products/Service Offerings
Total Revenue	185	146	380	300
Hybrid Platform & Solutions | Software | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	4,665	4,390	8,844	8,470
Transaction Processing | Software | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	1,943	1,776	3,685	3,468
Business Transformation | Consulting | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	2,295	2,227	4,578	4,482
Application Operations | Consulting | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	1,758	1,653	3,494	3,272
Technology Consulting | Consulting | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	961	928	1,904	1,884
Hybrid Infrastructure | Infrastructure | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	2,260	2,760	3,969	4,461
Infrastructure Support | Infrastructure | Operating Segments
Revenue by Major Products/Service Offerings
Revenue	$ 1,358	$ 1,474	$ 2,747	$ 2,993