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Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Forward Contracts | Derivatives Designated for Hedge Accounting |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 323 | $ 399
Foreign Exchange Contract | Derivatives Designated for Hedge Accounting | Cross currency swaps (non-current) |  |
Derivative [Line Items] |  |
Derivative, notional amount | 546 |
Foreign Exchange Contract | Derivatives Not Designated for Hedge Accounting |  |
Derivative [Line Items] |  |
Derivative, notional amount | 876 | 1,755
Net gain (losses) on derivatives | $ 60 | $ (189)

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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