Derivative and Hedging Activities - Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 31, 2020
Designated as Hedging Instrument | Fair Value Hedging
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 9	$ 0
Derivative liability, fair value	5	20
Designated as Hedging Instrument | Fair Value Hedging | Foreign currency forward contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	9	0
Designated as Hedging Instrument | Fair Value Hedging | Foreign currency forward contracts | Accrued expenses and other current liabilities
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	6	16
Derivative liability, fair value	17	12
Not Designated as Hedging Instrument | Foreign currency forward contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	6	16
Not Designated as Hedging Instrument | Foreign currency forward contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 17	$ 12