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Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 31, 2015
Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, maturity date |  |  | Mar. 31, 2016 |  |
Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, maturity date |  |  | Mar. 31, 2020 |  |
Foreign Exchange Contract |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Description of foreign currency derivative activities |  |  | manage the impact of foreign currency fluctuations |  |
Foreign Exchange Contract | Derivatives designated for hedge accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | $ 399 |  | $ 399 |  | $ 399
Foreign Exchange Contract | Derivatives not designated for hedge accounting |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional values designated for hedge accounting | 1,894 |  | 1,894 |  | $ 1,755
Net gains (losses) from changes in fair value not designated for hedge accounting | $ 67 | $ (30) | $ 22 | $ (50) |
Foreign Exchange Contract | Derivatives not designated for hedge accounting | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maturity of foreign currency derivatives |  |  | Oct. 31, 2015 |  |
Foreign Exchange Contract | Derivatives not designated for hedge accounting | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maturity of foreign currency derivatives |  |  | Jun. 15, 2016 |  |

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- Definition General discussion of the entity's foreign currency derivative activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579240-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41638-113959 + Details
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