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Debt and Financing Activities - Senior Bridge Term Loan Facilities (Details) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 EUR (€) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Repayments of loan | $ |  | $ 1,601 | $ 1,598 | $ 353
4.00% Euro Bonds due October 18, 2016 | Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of loan | € | € 350,000,000 |  |  |

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