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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 172 | $ (1,989) | $ 83
Foreign Currency Translation Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 113 | (1,845) | 9
Amounts reclassified to earnings | 0 | (10) | 44
Other Comprehensive Income (Loss), Net of Tax | 113 | (1,855) | 53
Tax expense (benefit) | (23) | 0 | 0
Reclassification, tax expense | 0 | 0 | 24
Unrealized Losses on Cash Flow Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 6 | (13) | (6)
Amounts reclassified to earnings | 3 | 3 | 0
Other Comprehensive Income (Loss), Net of Tax | 9 | (10) | (6)
Tax expense (benefit) | 0 | 0 | 0
Reclassification, tax expense | 0 | 0 | 0
Changes in Retirement-Related Benefit Plans, Net Actuarial Gain (Loss) and Prior Service Credit (Cost) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 23 | (140) | 17
Amounts reclassified to earnings | 30 | 11 | 22
Tax expense (benefit) | 13 | (66) | 16
Reclassification, tax expense | 18 | 6 | 12
Changes in Retirement-Related Benefit Plans, Foreign Currency Translation Adjustments and Other |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (3) | 4 | (4)
Amounts reclassified to earnings | 0 | 1 | 1
Tax expense (benefit) | 0 | 0 | 0
Reclassification, tax expense | $ 0 | $ 0 | $ 1

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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