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Stockholders' Equity - Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Foreign currency translation adjustments |  |  |  |
Foreign currency translation adjustments arising during period, net of income tax expense of nil, nil, nil and nil | $ (243) | $ (667) | $ 104 | $ (569)
Reclassified to income statement, net of income tax expense of nil, nil, nil and nil | 0 | (10) | 0 | (10)
Foreign currency translation adjustments | (243) | (677) | 104 | (579)
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 | 2 | 0 | 6 | (2)
Changes in retirement-related benefit plans |  |  |  |
Net actuarial gain (loss) and prior service cost arising during the period, net of income tax benefit of $1, nil, $9 and nil | 1 | 0 | (28) | 0
Amortization of actuarial loss and prior service costs, net of income tax expense of $5, $2, $9 and $3 | 8 | 3 | 15 | 6
Foreign currency translation adjustments, net of income tax expense of nil, nil, nil and nil | 2 | 3 | (4) | 2
Changes in retirement-related benefit plans | 11 | 6 | (17) | 8
Other comprehensive income (loss), net of tax | (230) | (671) | 93 | (573)
Foreign currency translation adjustments arising during period, income tax expense | 0 | 0 | 0 | 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 | 1 | 0 | 9 | 0
Amortization of actuarial loss and prior service costs, income tax expense | 5 | 2 | 9 | 3
Foreign currency translation adjustments, income tax expense | $ 0 | $ 0 | $ 0 | $ 0

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