| **Financial Instruments**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Financial Instruments [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Financial Instruments                | (3) FINANCIAL INSTRUMENTSCash and Cash EquivalentsAs of December 31, 2013 and March 31, 2013, our cash and cash equivalents were $1,746 million and $1,292 million, respectively. Cash equivalents were valued at their carrying amounts as they approximate fair value due to the short maturities of these financial instruments.Short-Term InvestmentsShort-term investments consisted of the following as of December 31, 2013 and March 31, 2013 (in millions):  As of December 31, 2013 As of March 31, 2013 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$168 $— $— $168 $177 $1 $— $178U.S. agency securities51 — — 51 76 — — 76U.S. Treasury securities64 — — 64 85 — — 85Commercial paper41 — — 41 49 — — 49Short-term investments$324 $— $— $324 $387 $1 $— $388We evaluate our investments for impairment quarterly. Factors considered in the review of investments with an unrealized loss include the credit quality of the issuer, the duration that the fair value has been less than the adjusted cost basis, the severity of the impairment, the reason for the decline in value and potential recovery period, the financial condition and near-term prospects of the investees, our intent to sell and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value, and any contractual terms impacting the prepayment or settlement process. Based on our review, we did not consider these investments to be other-than-temporarily impaired as of December 31, 2013 and March 31, 2013.The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of December 31, 2013 and March 31, 2013 (in millions):  As of December 31, 2013 As of March 31, 2013 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$106 $106 $160 $160Due in 1-2 years106 106 126 127Due in 2-3 years107 107 101 101Due in 3-4 years5 5 — —Short-term investments$324 $324 $387 $3880.75% Convertible Senior Notes Due 2016The following table summarizes the carrying value and fair value of our 0.75% Convertible Senior Notes due 2016 as of December 31, 2013 and March 31, 2013 (in millions):  As of December 31, 2013 As of March 31, 2013 CarryingValue FairValue CarryingValue FairValue0.75% Convertible Senior Notes due 2016$575 $682 $559 $614The carrying value of the 0.75% Convertible Senior Notes due 2016 excludes the fair value of the equity conversion feature, which was classified as equity upon issuance, while the fair value is based on quoted market prices for the 0.75% Convertible Senior Notes due 2016, and includes the equity conversion feature. The fair value of the 0.75% Convertible Senior Notes due 2016 is classified as Level 2 within the fair value hierarchy. See Note 12 for additional information related to our 0.75% Convertible Senior Notes due 2016. |

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| - Definition
The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures.
+ References
No definition available.
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