Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2021	Mar. 31, 2021
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	$ 641
Foreign currency translation	(12)
Goodwill, gross	10,185	$ 10,197
Accumulated impairment losses	(9,556)	(9,556)
Goodwill, ending balance	629
GBS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	641
Foreign currency translation	(12)
Goodwill, gross	5,119	5,131
Accumulated impairment losses	(4,490)	(4,490)
Goodwill, ending balance	629
GIS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation	0
Goodwill, gross	5,066	5,066
Accumulated impairment losses	(5,066)	$ (5,066)
Goodwill, ending balance	$ 0