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Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Cross Currency Swap | Derivatives Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | $ 1,839 |  | $ 1,839 |  | $ 546
Forward Contract | Derivatives Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | 323 |  | 323 |  | 323
Forward Contract | Derivatives not Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net (loss) gains from changes in fair value not designated for hedge accounting | (1) | $ (24) | 4 | $ (2) |
U.S. dollar hedge against CAD cash flow | Forward Contract | Derivatives not Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | 882 |  | 882 |  |
Euro hedge against Pound and other European currency cash flows | Forward Contract | Derivatives not Designated for Hedge Accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | $ 99 |  | $ 99 |  | $ 876

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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: 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=64837297&loc=SL5618551-113959 + Details
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