| **Financial Instruments**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Financial Instruments [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Financial Instruments                | (3) FINANCIAL INSTRUMENTSCash and Cash EquivalentsAs of September 30, 2016 and March 31, 2016, our cash and cash equivalents were $1,746 million and $2,493 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 September 30, 2016 and March 31, 2016 (in millions):  As of September 30, 2016 As of March 31, 2016 Cost orAmortizedCost Gross Unrealized FairValue Cost orAmortizedCost Gross Unrealized FairValue Gains Losses Gains Losses Corporate bonds$738 $1 $— $739 $620 $1 $— $621U.S. Treasury securities378 1 — 379 389 1 — 390U.S. agency securities154 — — 154 167 — — 167Commercial paper79 — — 79 50 — — 50Foreign government securities115 — — 115 113 — — 113Asset-backed securities54 — — 54 — — — —Short-term investments$1,518 $2 $— $1,520 $1,339 $2 $— $1,341The following table summarizes the amortized cost and fair value of our short-term investments, classified by stated maturity as of September 30, 2016 and March 31, 2016 (in millions):  As of September 30, 2016 As of March 31, 2016 AmortizedCost FairValue AmortizedCost FairValueShort-term investments       Due in 1 year or less$749 $749 $571 $571Due in 1-2 years415 416 461 462Due in 2-3 years295 296 295 296Due in 3-4 years59 59 12 12Short-term investments$1,518 $1,520 $1,339 $1,341 |

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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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