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Hedging Activities - Narrative (Details) £ in Millions, $ in Millions, € in Billions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2017 EUR (€) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 GBP (£)
Derivative [Line Items] |  |  |  |  |  |
Total debt outstanding |  | $ 8,107 |  |  | $ 8,362 |
Losses from net investment hedges | $ 13 |  |  |  |  |
Forward Contracts | Derivatives Designated for Hedge Accounting |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 323 |  |  | 243 |
Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net gain (losses) on derivatives | $ 5 | 60 | $ (189) |  |  |
Currency Swap | Derivatives Designated for Hedge Accounting |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | 546 |  |  | 2,663 |
Euro Denominated Notes | Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Total debt outstanding | € |  |  |  | € 1.2 |  |
British Pound Sterling Denominated Notes | Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Total debt outstanding | £ |  |  |  |  |  | £ 450
Canada, Dollars | Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | 173 |
United Kingdom, Pounds | Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount |  | $ 876 |  |  | $ 62 |

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