Receivables - Narrative (Details)	12 Months Ended
	Mar. 31, 2021 USD ($) extension	Mar. 31, 2021 EUR (€) extension	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Extension term	1 year
Purchasers
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Receivables facility, amount			$ 500,000,000	$ 600,000,000
Deferred purchase price for receivables	$ 0				$ 0	$ 574,000,000
Availability under receivable facility	350,000,000
Drawn amount	390,000,000
Liability for excess cash proceeds	$ 40,000,000
Number of extensions | extension	1	1
Gain (loss) on sale of receivables	$ 0
DE Purchasers
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Receivables facility, amount	175,000,000	€ 150,000,000			102,000,000
Deferred purchase price for receivables	0				$ 103,000,000	$ 0
Availability under receivable facility	117,000,000
Drawn amount	$ 114,000,000
Number of extensions | extension	1	1
Extension term	1 year
Gain (loss) on sale of receivables	$ 0
Receivable	$ 3,000,000