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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Subsequent Events (Details) € in Millions, $ in Millions			1 Months Ended	12 Months Ended
Subsequent Events (Details) € in Millions, $ in Millions	Apr. 01, 2021 USD ($)	Mar. 16, 2021 USD ($)	Oct. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Apr. 01, 2021 EUR (€)
Subsequent Event [Line Items]
Repayments of debt			$ 3,500	$ 3,552	$ 1,039	$ 2,625
Subsequent Event \| HPS Business
Subsequent Event [Line Items]
Transaction consideration	$ 543						€ 462
Senior Notes, Due 2023 \| Senior notes \| Subsequent Event
Subsequent Event [Line Items]
Effective interest rate	4.45%						4.45%
Repayments of debt	$ 154
Senior Notes, Due 2023 \| Senior notes
Subsequent Event [Line Items]
Effective interest rate		4.45%		4.45%
Repayments of debt		$ 6
Senior Notes, Due 2023 \| Senior notes \| Subsequent Event
Subsequent Event [Line Items]
Effective interest rate	4.45%						4.45%
Repayments of debt	$ 165