Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Foreign Currency Forward And Option Contracts Maximum Maturity Period	15 months
Foreign Currency Forward Contracts Maximum Maturity Period	3 months
Fair value of foreign currency contracts outstanding, Assets		$ 6
Foreign exchange option contracts
Derivative [Line Items]
Fair value of foreign currency contracts outstanding, Assets		6
Foreign currency contracts to purchase [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	3
Foreign currency contracts to purchase [Member] | Foreign exchange forward contracts
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	3
Foreign currency contracts to purchase [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional amount	179	84
Foreign currency contracts to purchase [Member] | Designated as Hedging Instrument [Member] | Foreign exchange option contracts
Derivative [Line Items]
Derivative, Notional amount	0	84
Foreign currency contracts to purchase [Member] | Designated as Hedging Instrument [Member] | Foreign exchange forward contracts
Derivative [Line Items]
Derivative, Notional amount	179
Foreign currency contracts to sell [Member]
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	2
Foreign currency contracts to sell [Member] | Foreign exchange forward contracts
Derivative [Line Items]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value	2
Foreign currency contracts to sell [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional amount	363	149
Foreign currency contracts to sell [Member] | Designated as Hedging Instrument [Member] | Foreign exchange option contracts
Derivative [Line Items]
Derivative, Notional amount	0	149
Foreign currency contracts to sell [Member] | Designated as Hedging Instrument [Member] | Foreign exchange forward contracts
Derivative [Line Items]
Derivative, Notional amount	363
Balance Sheet Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Current	1
Foreign currency contracts to sell [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional amount		$ 219