Revenue Recognition - Hybrid Cloud Revenue by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	$ 5,863	$ 4,979	$ 10,872	$ 9,369
Software
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	2,288	2,015	4,418	3,760
Consulting
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	2,286	1,901	4,421	3,623
Infrastructure
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	1,220	981	1,892	1,818
Other.
Revenue by Major Products/Service Offerings
Hybrid cloud revenue	$ 69	$ 82	$ 141	$ 169