Derivative Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2017

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, 2017						As of March 31, 2017
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	167	$	8	$	—	$	185	$	—	$	5
Forward contracts to sell	$	1,146	$	1	$	48	$	840	$	19	$	3

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [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, 2017						As of March 31, 2017
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	139	$	—	$	—	$	87	$	—	$	—
Forward contracts to sell	$	425	$	—	$	—	$	166	$	—	$	—

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, 2017 and 2016, 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,
		2017			2016		2017			2016
Foreign currency forward contracts not designated as hedging instruments	Interest and other income (expense), net	$	(3	)	$	3	$	(9	)	$	1