| **Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($) $ in Millions**   | Sep. 30, 2016 | Mar. 31, 2016 |
|------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| Foreign exchange forward contracts to purchase [Member]                                                                                  |          |          |
| **Derivative Instruments and Hedging Activities Disclosures [Line Items]**                                                               |          |          |
| Fair value of foreign currency contracts outstanding, Assets                                                                             | $ 0           | $ 5           |
| Fair value of foreign currency contracts outstanding, Liabilities                                                                        | 2             | 1             |
| Foreign exchange forward contracts to sell [Member]                                                                                      |          |          |
| **Derivative Instruments and Hedging Activities Disclosures [Line Items]**                                                               |          |          |
| Fair value of foreign currency contracts outstanding, Assets                                                                             | 33            | 11            |
| Fair value of foreign currency contracts outstanding, Liabilities                                                                        | 9             | 9             |
| Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to purchase [Member]                                      |          |          |
| **Derivative Instruments and Hedging Activities Disclosures [Line Items]**                                                               |          |          |
| Derivative, Notional amount                                                                                                              | 137           | 148           |
| Designated as Hedging Instrument [Member] | Foreign exchange forward contracts to sell [Member]                                          |          |          |
| **Derivative Instruments and Hedging Activities Disclosures [Line Items]**                                                               |          |          |
| Derivative, Notional amount                                                                                                              | 936           | 685           |
| 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                                                                                                              | 89            | 108           |
| 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                                                                                                              | 485           | 159           |
| 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                                                                                                                | 0             | 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                                                                                                                | 0             | 0             |
| Derivative Liability, Current                                                                                                            | $ 0           | $ 0           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.
+ References
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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of all asset derivatives designated as cash flow hedging instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or 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
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| X                                                                                                                                                                               |
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| X                                                                                                                                                                           |
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| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                     |
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| X                                                                                                                                                  |
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| X                                                                                                                                                                                   |
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