Revenue - Change in Contract Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Balance, beginning of period	$ 1,756	$ 1,886
Deferred revenue	2,111	2,091
Recognition of deferred revenue	(2,137)	(2,137)
Currency translation adjustment	146	12
Other	(108)	(36)
Balance, end of period	1,768	$ 1,816
HHS Business
Disaggregation of Revenue [Line Items]
Other	$ (54)