Location of Gain (Loss) Recognized in Income on Derivative, Non-Designated Hedging Instruments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Interest And Other Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency forward contracts not designated as hedging instruments	$ (5)	$ (2)	$ 21
Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional amount		219
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to purchase [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional amount	140	87
United States Dollar [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional amount	232	213
British Pounds Sterling [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts to sell [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional amount		6
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Current	$ 1