Derivative Instruments - Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 9	$ 0
Derivative liability, fair value	5	20
Designated as Hedging Instrument | Other current assets | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	9	0
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	5	20
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	3	16
Derivative liability, fair value	3	12
Not Designated as Hedging Instrument | Other current assets | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	3	16
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 3	$ 12