Derivative Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2016

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, 2016						As of March 31, 2016
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	137	$	—	$	2	$	148	$	5	$	1
Forward contracts to sell	$	936	$	33	$	9	$	685	$	11	$	9

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, 2016						As of March 31, 2016
	Notional Amount		Fair Value				Notional Amount		Fair Value
			Asset		Liability				Asset		Liability
Forward contracts to purchase	$	89	$	—	$	—	$	108	$	—	$	—
Forward contracts to sell	$	485	$	—	$	—	$	159	$	—	$	—