| **Derivative Financial Instruments Derivative Financial Instruments (Tables)**                                                                               | 9 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 December 31, 2015 As of March 31, 2015 Notional Amount Fair Value Notional Amount Fair Value  Asset Liability  Asset LiabilityForward contracts to purchase$148 $1 $6 $108 $— $8Forward contracts to sell$627 $14 $1 $508 $18 $1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| 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 December 31, 2015 As of March 31, 2015 Notional Amount Fair Value Notional Amount Fair Value  Asset Liability  Asset LiabilityForward contracts to purchase$165 $— $— $99 $— $—Forward contracts to sell$573 $2 $1 $173 $— $—The effect of foreign currency forward contracts not designated as hedging instruments in our Condensed Consolidated Statements of Operations for the three and nine months ended December 31, 2015 and 2014, was as follows (in millions): Statement of Operations Classification Amount of Gain (Loss) Recognized in the Statement of Operations Three Months Ended December 31, Nine Months Ended December 31, 2015 2014 2015 2014Foreign currency forward contracts not designated as hedging instrumentsInterest and other income (expense), net $13 $19 $15 $38 |

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| - Definition
Derivative Financial Instruments [Abstract]
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No definition available.
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| - Definition
Tabular disclosure of the notional amounts of outstanding derivative positions.
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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=56946850&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.
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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=56946850&loc=SL5624171-113959
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