| **Financial Instruments**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| **Financial Instruments [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Financial Instruments                | (3) FINANCIAL INSTRUMENTSCash and Cash EquivalentsAs of December 31, 2015 and March 31, 2015, our cash and cash equivalents were $2,263 million and $2,068 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, 2015 and March 31, 2015 (in millions):  As of December 31, 2015 As of March 31, 2015 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$579 $— $(1) $578 $467 $— $— $467U.S. Treasury securities196 — (1) 195 214 — — 214U.S. agency securities154 — — 154 161 1 — 162Commercial paper39 — — 39 110 — — 110Short-term investments$968 $— $(2) $966 $952 $1 $— $953We evaluate our investments for impairment quarterly. Factors considered in the review of investments 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, 2015 and March 31, 2015.The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of December 31, 2015 and March 31, 2015 (in millions):  As of December 31, 2015 As of March 31, 2015 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$441 $441 $417 $417Due in 1-2 years306 305 281 281Due in 2-3 years221 220 244 245Due in 3-4 years— — 10 10Short-term investments$968 $966 $952 $953 |

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| - Definition
FINANCIAL INSTRUMENTS [Abstract]
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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.
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No definition available.
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