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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | $ (688) | $ 142 |
Amounts reclassified to earnings | 29 | 30 |
Other Comprehensive Income (Loss), Net of Tax | (659) | 172 | $ (1,989)
Foreign Currency Translation Adjustments, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (644) | 113 | (1,845)
Amounts reclassified to earnings | 20 | 0 | (10)
Other Comprehensive Income (Loss), Net of Tax | (624) | 113 | (1,855)
Tax expense (benefit) | 1 | 23 | 0
Reclassification, tax expense | 0 | 0 | 0
Unrealized Losses on Net Investment Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (8) | 0 | 0
Amounts reclassified to earnings | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax | (8) | 0 | 0
Tax expense (benefit) | 5 | 0 | 0
Reclassification, tax expense | 0 | 0 | 0
Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (19) | 6 | (13)
Amounts reclassified to earnings | 0 | 3 | 3
Other Comprehensive Income (Loss), Net of Tax | (19) | 9 | (10)
Tax expense (benefit) | 0 | 0 | 0
Reclassification, tax expense | 0 | 0 | 0
Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax expense (benefit) of $4, $13 and ($66) (6) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | (20) | 23 | (140)
Tax expense (benefit) | (4) | (13) | 66
Reclassification, tax expense | 4 | 18 | 6
Amortization of actuarial gain (loss), prior service cost and transition obligation, net of income tax expense (benefit) of $4, $18 and $6 (7) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 9 | 30 | 11
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 | (3) | 4
Tax expense (benefit) | 0 | 0 | 0
Reclassification, tax expense | 0 | 0 | 0
Unrealized Net Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amounts reclassified to earnings | 0 | 0 | 1
Other Comprehensive Income (Loss), Net of Tax | $ (8) | $ 50 | $ (124)

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