Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2015	Mar. 31, 2015
Foreign currency contracts to purchase \| Foreign exchange forward contracts
Derivative
Fair value of foreign currency contracts outstanding, Assets	$ 1	$ 0
Fair value of foreign currency contracts outstanding, Liabilities	6	8
Foreign currency contracts to purchase \| Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts
Derivative
Derivative, Notional amount	148	108
Foreign currency contracts to sell \| Foreign exchange forward contracts
Derivative
Fair value of foreign currency contracts outstanding, Assets	14	18
Fair value of foreign currency contracts outstanding, Liabilities	1	1
Foreign currency contracts to sell \| Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts
Derivative
Derivative, Notional amount	627	508
Foreign currency contracts to purchase \| United States Dollar [Member] \| Not Designated as Hedging Instrument [Member]
Derivative
Derivative, Notional amount	165	99
Foreign currency contracts to purchase \| Balance Sheet Hedging [Member] \| Not Designated as Hedging Instrument [Member]
Derivative
Derivative Asset, Current	0	0
Derivative Liability, Current	0	0
Foreign currency contracts to sell \| United States Dollar [Member] \| Not Designated as Hedging Instrument [Member]
Derivative
Derivative, Notional amount	573	173
Foreign currency contracts to sell \| Balance Sheet Hedging [Member] \| Not Designated as Hedging Instrument [Member]
Derivative
Derivative Asset, Current	2	0
Derivative Liability, Current	$ 1	$ 0

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fair value of all asset derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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- Definition

Fair value of all liability derivatives designated as cash flow hedging instruments.

+ References

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Assets
-URI http://asc.fasb.org/extlink&oid=6509628

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Current Liabilities
-URI http://asc.fasb.org/extlink&oid=6509677

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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No definition available.

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