Derivative Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2018

Derivative Financial Instruments [Abstract]

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

	As of March 31, 2018						As of March 31, 2017
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	329	$	2	$	4	$	185	$	—	$	5
Forward contracts to sell	$	1,575	$	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 March 31, 2018						As of March 31, 2017
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	210	$	1	$	1	$	87	$	—	$	—
Forward contracts to sell	$	257	$	—	$	3	$	166	$	—	$	—

The effect of foreign currency forward contracts not designated as hedging instruments in our Consolidated Statements of Operations for the fiscal years ended March 31, 2018, 2017 and 2016, was as follows (in millions):

	Statement of Operations Classification	Amount of Gain (Loss) Recognized in the Statement of Operations
		Year Ended March 31,
		2018			2017		2016
Foreign currency forward contracts not designated as hedging instruments	Interest and other  income (expense), net	$	(26	)	$	43	$	16