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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |  |
Average cost per share (dollars per share) | $ 140.96 | $ 186.99 | $ 140.96 |
Foreign currency translation adjustments |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax expense (benefit) of $11, nil, ($1) and nil | $ (398,000,000) | $ (246,000,000) | $ (782,000,000) | $ (142,000,000)
Reclassified to income statement, net of income tax expense of nil, nil nil and nil | 0 | 0 | 20,000,000 | 0
Foreign currency translation adjustments | (398,000,000) | (246,000,000) | (762,000,000) | (142,000,000)
Unrealized gains (losses) on cash flow hedges |  |  |  |
Unrealized gains (losses) on cash flow hedges arising during period, net of income tax expense of nil, nil, nil and nil | (14,000,000) | (1,000,000) | (20,000,000) | 5,000,000
Changes in retirement-related benefit plans |  |  |  |
Net actuarial loss and prior service cost arising during the period, net of income tax benefit of nil, nil, nil and $9 | 0 | 0 | 0 | (28,000,000)
Amortization of actuarial loss and prior service costs, net of income tax expense of $1, $5, $2 and $9 | 2,000,000 | 8,000,000 | 6,000,000 | 23,000,000
Foreign currency translation adjustments and other, net of income tax expense of nil, nil, nil and nil | 6,000,000 | 7,000,000 | 14,000,000 | 3,000,000
Changes in retirement-related benefit plans | 8,000,000 | 15,000,000 | 20,000,000 | (2,000,000)
Other Comprehensive Income (Loss), Net of Tax | (404,000,000) | (232,000,000) | (762,000,000) | (139,000,000)
Foreign currency translation adjustments arising during period, tax benefit | 0 | 3,000,000 | 1,000,000 | 3,000,000
Reclassified to income statement, tax expense | 0 | 0 | 0 | 0
Unrealized gains (losses) on cash flow hedges arising during period, tax expense | 0 | 0 | 0 | 0
Net actuarial gain (loss) and prior service cost arising during the period, tax benefit | 0 | 0 | 0 | 9,000,000
Amortization of actuarial loss and prior service costs, tax expense | 1,000,000 | 4,000,000 | 3,000,000 | 13,000,000
Foreign currency translation adjustments, tax expense | $ 0 | $ 0 | $ 0 | $ 0

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