Revenue - Capitalized Contract Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Capitalized sales commission cost
Capitalized Contract Cost [Line Items]
Capitalized contract cost, net	$ 125	$ 191
Capitalized contract cost, amortization	76	85	$ 70
Transition and transformation contract costs, net
Capitalized Contract Cost [Line Items]
Capitalized contract cost, net	778	818
Capitalized contract cost, amortization	$ 204	$ 227	$ 264