| **Derivative Financial Instruments (Tables)**                                                                                                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Derivative Financial Instruments [Abstract]**                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]                                                                          | Total gross notional amounts and fair values for currency derivatives with cash flow hedge accounting designation are as follows (in millions):  As of September 30, 2016 As of March 31, 2016 Notional Amount Fair Value Notional Amount Fair Value  Asset Liability  Asset LiabilityForward contracts to purchase$137 $— $2 $148 $5 $1Forward contracts to sell$936 $33 $9 $685 $11 $9                                                        |
| Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | Total gross notional amounts and fair values for currency derivatives that are not designated as hedging instruments are accounted for as follows (in millions): As of September 30, 2016 As of March 31, 2016 Notional Amount Fair Value Notional Amount Fair Value  Asset Liability  Asset LiabilityForward contracts to purchase$89 $— $— $108 $— $—Forward contracts to sell$485 $— $— $159 $— $— |

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| - Definition
Derivative Financial Instruments [Abstract]
+ References
No definition available.
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| - Definition
Tabular disclosure of the notional amounts of outstanding derivative positions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959
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| - Definition
Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959
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