Pension Benefits - Narrative (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense	$ 2	$ 7	$ 2	$ 14
Cash contributions to the plans	$ 3	$ 4	$ 17	$ 11
Percentage threshold of greater of projected benefit obligation or market value of assets (percent)	10.00%		10.00%
Held-for-sale | European Businesses (Disposal Group)
Defined Benefit Plan Disclosure [Line Items]
Reclassified pension liabilities	$ 108		$ 108