| **Derivative Financial Instruments (Tables)**                                                                                                                | 12 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: As of March 31, 2014As of March 31, 2013Notional AmountFair ValueNotional AmountFair ValueAssetLiabilityAssetLiabilityOption contracts to purchase$—$—$—$84$—$—Forward contracts to purchase179—3———Total$179 $— $3 $84 $— $—Option contracts to sell$—$—$—$149$6$—Forward contracts to sell363—2———Total$363 $— $2 $149 $6 $—                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 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:  As of March 31, 2014 As of March 31, 2013 Notional Amount Fair Value Notional Amount Fair Value  Asset Liability  Asset LiabilityForward contracts to purchase in exchange for USD$140 $— $1 $87 $— $—Total$140 $— $1 $87 $— $—            Forward contracts to sell in exchange for USD$232 $— $— $213 $— $—Forward contracts to sell in exchange for GBP— — — 6 — —Total$232 $— $— $219 $— $—The effect of foreign currency forward contracts not designated as hedging instruments in our Consolidated Statements of Operations for the fiscal years ended March 31, 2014, 2013 and 2012, was as follows (in millions): Location of Gain (Loss) Recognized in Income onDerivative Amount of Gain (Loss) Recognized in Income on Derivative Year Ended March 31, 2014 2013 2012Foreign currency forward contracts not designated as hedging instrumentsInterest and other income (expense), net $(5) $(2) $21 |

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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=7476318&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=7476318&loc=SL5624171-113959
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