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Debt and Financing Activities - Other Information (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 26, 2017 EUR (€) | May 26, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Future principal payments of long-term debt in 2017 |  |  | $ 1,057,000,000 |  |
Future principal payments of long-term debt in 2018 |  |  | 1,503,000,000 |  |
Future principal payments of long-term debt in 2019 |  |  | 11,000,000 |  |
Future principal payments of long-term debt in 2020 |  |  | 605,000,000 |  |
Future principal payments of long-term debt in 2021 |  |  | 641,000,000 |  |
Future principal payments of long-term debt, thereafter |  |  | 4,545,000,000 |  |
Repayments of loan |  |  | 1,601,000,000 | $ 1,598,000,000 | $ 353,000,000
Total debt outstanding |  |  | $ 8,362,000,000 | 8,107,000,000 |
Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of loan |  |  |  | 93,000,000 |
0.95% Notes Due December 4 2015 | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of loan |  |  |  | $ 500,000,000 |
Debt interest rate (percent) |  |  |  | 0.95% |
3.25% Notes Due March 1 2016 | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of loan |  |  |  | $ 600,000,000 |
Debt interest rate (percent) |  |  |  | 3.25% |
Subsequent Event | 4.50% Euro Bonds due April 26, 2017 | Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of loan | € 500,000,000 | $ 545,000,000 |  |  |

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