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Stockholders' Equity - Schedule of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Foreign currency translation adjustments |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax benefit of $3, nil, $3 and nil | $ (246) | $ (416) | $ (142) | $ (985)
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | 0 | 0 | 0 | (10)
Foreign currency translation adjustments | (246) | (416) | (142) | (995)
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 | (1) | 1 | 5 | (1)
Changes in retirement-related benefit plans |  |  |  |
Net actuarial gain (loss) and prior service cost arising during the period, net of income tax benefit of nil, $6, $9 and $6 | 0 | (21) | (28) | (21)
Amortization of actuarial loss and prior service costs, net of income tax expense of $4, $2, $13 and $5 | 8 | 3 | 23 | 9
Foreign currency translation adjustments, net of income tax expense of nil, nil, nil and nil | 7 | 2 | 3 | 4
Changes in retirement-related benefit plans | 15 | (16) | (2) | (8)
Other comprehensive income (loss), net of tax | (232) | (431) | (139) | (1,004)
Foreign currency translation adjustments arising during period, income tax benefit | 3 | 0 | 3 | 0
Reclassified to income statement, income tax expense | 0 | 0 | 0 | 0
Unrealized gains (losses) on cash flow hedges arising during period, income tax expense | 0 | 0 | 0 | 0
Net actuarial gain (loss) and prior service cost arising during the period, income tax benefit | 0 | 6 | 9 | 6
Amortization of actuarial loss and prior service costs, income tax expense | 4 | 2 | 13 | 5
Foreign currency translation adjustments, income tax expense | $ 0 | $ 0 | $ 0 | $ 0

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