Derivative Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2018

Derivative Financial Instruments [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows (in millions):

	As of September 30, 2018						As of March 31, 2018
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	236	$	1	$	7	$	329	$	2	$	4
Forward contracts to sell	$	1,453	$	48	$	—	$	1,575	$	1	$	48

Derivatives Not Designated as Hedging Instruments [Table Text Block]

Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows (in millions):

	As of September 30, 2018						As of March 31, 2018
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	233	$	—	$	—	$	210	$	1	$	1
Forward contracts to sell	$	565	$	—	$	3	$	257	$	—	$	3

The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for the three and six months ended September 30, 2018 and 2017 was as follows (in millions):

	Statement of Operations Classification	Amount of Gain (Loss) Recognized in the Statement of Operations
		Three Months Ended September 30,						Six Months Ended September 30,
		2018			2017			2018		2017
Foreign currency forward contracts not designated as hedging instruments	Interest and other income (expense), net	$	(5	)	$	(3	)	$	4	$	(9	)