Revenue Recognition - Hybrid Cloud Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	$ 5,009	$ 4,390
Software
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	2,130	1,744
Consulting
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	2,135	1,722
Infrastructure
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	672	837
Other.
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	$ 72	$ 87