Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2017	Mar. 31, 2017
Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of foreign currency contracts outstanding, Assets	$ 5	$ 0
Fair value of foreign currency contracts outstanding, Liabilities	1	5
Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of foreign currency contracts outstanding, Assets	1	19
Fair value of foreign currency contracts outstanding, Liabilities	33	3
Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	209	185
Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	985	840
United States Dollar [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	354	87
United States Dollar [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional amount	785	166
Balance Sheet Hedging [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to purchase [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Current	1	0
Derivative Liability, Current	0	0
Balance Sheet Hedging [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign exchange forward contracts to sell [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Current	1	0
Derivative Liability, Current	$ 7	$ 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=84234895&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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- Definition

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=77997519&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
-Topic 815
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-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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