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Hedging Activities - Narrative (Details) - Foreign Exchange Contract - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Derivatives Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | $ 399 |  | $ 399 |  | $ 399
Derivatives not Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | 1,878 |  | 1,878 |  | $ 1,755
Net losses from changes in fair value not designated for hedge accounting | $ 24 | $ 24 | $ 2 | $ 74 |

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