Income Taxes	3 Months Ended
Jan. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We compute, on a quarterly basis, an estimated annual effective tax rate considering ordinary income and related income tax expense. For all periods presented, U.S. and certain foreign results are excluded from ordinary income due to ordinary losses for which no benefit can be recognized. Ordinary income refers to income (loss) before income tax expense excluding significant unusual or infrequently occurring items. The tax effect of a significant unusual or infrequently occurring item is recorded in the interim period in which the item occurs. Items included in income tax expense in the periods in which they occur include the tax effects of material restructurings, impairments, cumulative effect of changes in tax laws or rates, foreign exchange gains and losses, adjustments to uncertain tax positions, and adjustments to our valuation allowance due to changes in judgment regarding the ability to realize deferred tax assets in future years. We have reviewed the impact of recently enacted U.S. tax legislation, the most significant of which is the Protecting Americans from Tax Hikes Act of 2015 ("PATH Act of 2015"), which extended the rules allowing us to forego bonus depreciation in exchange for refunds of previously paid Alternative Minimum Tax ("AMT"). This change has resulted in the likely realization of our deferred AMT credits, on a more likely than not basis, which supports the release of the associated valuation allowance. In addition, PATH Act of 2015 extended the "look-through rule," under subpart F of the U.S. Internal Revenue Code, which had expired for us on September 30, 2015. The "look-through rule" had provided an exception to the U.S. taxation of certain income generated by foreign subsidiaries. The rule was extended in December 2015 with retroactive effect to the beginning of our 2016 fiscal year, and the rule will remain in place through our 2020 fiscal year. This rule extension will allow us to reverse recently recognized deferred tax liabilities associated with earnings in foreign jurisdictions. However, since the reversal of this deferred tax liability will also have an associated and completely offsetting valuation allowance effect, there is no impact to total deferred taxes due to this change. In the first quarter of 2016, we elected to early adopt the provisions of ASU 2015-17, “Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes.” This ASU requires the offset of all deferred tax assets and liabilities, including valuation allowances, for each tax-paying jurisdiction within each tax-paying component. The net deferred tax must be presented as a single noncurrent amount for each jurisdiction. In accordance with the adoption of ASU 2015-17 we have chosen to apply this change prospectively, and as a result, prior year amounts are maintained as originally filed. We have evaluated the need to maintain a valuation allowance for deferred tax assets based on our assessment of whether it is more likely than not that deferred tax benefits will be realized through the generation of future taxable income. Appropriate consideration is given to all available evidence, both positive and negative, in assessing the need for a valuation allowance. As mentioned above, we have concluded that the valuation allowance on our U.S. deferred AMT credits is no longer necessary. This partial valuation allowance release resulted in an income tax benefit of $13 million. We continue to maintain a valuation allowance on our remaining U.S. deferred tax assets, as well as certain foreign deferred tax assets, that we believe, on a more-likely-than-not basis, will not be realized. For all remaining deferred tax assets, while we believe at January 31, 2016 that it is more likely than not that they will be realized, it is reasonably possible that additional deferred tax asset valuation allowances could be required in the next twelve months. We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such a position are measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of January 31, 2016, the amount of liability for uncertain tax positions was $41 million. The liability at January 31, 2016 has a recorded offsetting tax benefit associated with various issues that total $12 million. If the unrecognized tax benefits are recognized, all would impact our effective tax rate. However, to the extent we continue to maintain a full valuation allowance against certain deferred tax assets, the effect may be in the form of an increase in the deferred tax asset related to our net operating loss carryforward, which would be offset by a full valuation allowance. We recognize interest and penalties related to uncertain tax positions as part of Income tax expense. For the three months ended January 31, 2016 and 2015, total interest and penalties related to our uncertain tax positions resulted in an income tax expense of less than $1 million, for both periods. We have open tax years back to 2001 with various significant taxing jurisdictions including the U.S., Canada, Mexico, and Brazil. In connection with the examination of tax returns, contingencies may arise that generally result from differing interpretations of applicable tax laws and regulations as they relate to the amount, timing, or inclusion of revenues or expenses in taxable income, or the sustainability of tax credits to reduce income taxes payable. We believe we have sufficient accruals for our contingent tax liabilities. Annual tax provisions include amounts considered sufficient to pay assessments that may result from examinations of prior year tax returns, although actual results may differ. While it is probable that the liability for unrecognized tax benefits may increase or decrease during the next twelve months, we do not expect any such change would have a material effect on our financial condition, results of operations, or cash flows.

Income Taxes

We compute, on a quarterly basis, an estimated annual effective tax rate considering ordinary income and related income tax expense. For all periods presented, U.S. and certain foreign results are excluded from ordinary income due to ordinary losses for which no benefit can be recognized. Ordinary income refers to income (loss) before income tax expense excluding significant unusual or infrequently occurring items. The tax effect of a significant unusual or infrequently occurring item is recorded in the interim period in which the item occurs. Items included in income tax expense in the periods in which they occur include the tax effects of material restructurings, impairments, cumulative effect of changes in tax laws or rates, foreign exchange gains and losses, adjustments to uncertain tax positions, and adjustments to our valuation allowance due to changes in judgment regarding the ability to realize deferred tax assets in future years.

We have reviewed the impact of recently enacted U.S. tax legislation, the most significant of which is the Protecting Americans from Tax Hikes Act of 2015 ("PATH Act of 2015"), which extended the rules allowing us to forego bonus depreciation in exchange for refunds of previously paid Alternative Minimum Tax ("AMT"). This change has resulted in the likely realization of our deferred AMT credits, on a more likely than not basis, which supports the release of the associated valuation allowance. In addition, PATH Act of 2015 extended the "look-through rule," under subpart F of the U.S. Internal Revenue Code, which had expired for us on September 30, 2015. The "look-through rule" had provided an exception to the U.S. taxation of certain income generated by foreign subsidiaries. The rule was extended in December 2015 with retroactive effect to the beginning of our 2016 fiscal year, and the rule will remain in place through our 2020 fiscal year. This rule extension will allow us to reverse recently recognized deferred tax liabilities associated with earnings in foreign jurisdictions. However, since the reversal of this deferred tax liability will also have an associated and completely offsetting valuation allowance effect, there is no impact to total deferred taxes due to this change.

In the first quarter of 2016, we elected to early adopt the provisions of ASU 2015-17, “Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes.” This ASU requires the offset of all deferred tax assets and liabilities, including valuation allowances, for each tax-paying jurisdiction within each tax-paying component. The net deferred tax must be presented as a single noncurrent amount for each jurisdiction. In accordance with the adoption of ASU 2015-17 we have chosen to apply this change prospectively, and as a result, prior year amounts are maintained as originally filed.

We have evaluated the need to maintain a valuation allowance for deferred tax assets based on our assessment of whether it is more likely than not that deferred tax benefits will be realized through the generation of future taxable income. Appropriate consideration is given to all available evidence, both positive and negative, in assessing the need for a valuation allowance. As mentioned above, we have concluded that the valuation allowance on our U.S. deferred AMT credits is no longer necessary. This partial valuation allowance release resulted in an income tax benefit of $13 million. We continue to maintain a valuation allowance on our remaining U.S. deferred tax assets, as well as certain foreign deferred tax assets, that we believe, on a more-likely-than-not basis, will not be realized. For all remaining deferred tax assets, while we believe at January 31, 2016 that it is more likely than not that they will be realized, it is reasonably possible that additional deferred tax asset valuation allowances could be required in the next twelve months.

We recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such a position are measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. As of January 31, 2016, the amount of liability for uncertain tax positions was $41 million. The liability at January 31, 2016 has a recorded offsetting tax benefit associated with various issues that total $12 million. If the unrecognized tax benefits are recognized, all would impact our effective tax rate. However, to the extent we continue to maintain a full valuation allowance against certain deferred tax assets, the effect may be in the form of an increase in the deferred tax asset related to our net operating loss carryforward, which would be offset by a full valuation allowance.

We recognize interest and penalties related to uncertain tax positions as part of Income tax expense. For the three months ended January 31, 2016 and 2015, total interest and penalties related to our uncertain tax positions resulted in an income tax expense of less than $1 million, for both periods.

We have open tax years back to 2001 with various significant taxing jurisdictions including the U.S., Canada, Mexico, and Brazil. In connection with the examination of tax returns, contingencies may arise that generally result from differing interpretations of applicable tax laws and regulations as they relate to the amount, timing, or inclusion of revenues or expenses in taxable income, or the sustainability of tax credits to reduce income taxes payable. We believe we have sufficient accruals for our contingent tax liabilities. Annual tax provisions include amounts considered sufficient to pay assessments that may result from examinations of prior year tax returns, although actual results may differ. While it is probable that the liability for unrecognized tax benefits may increase or decrease during the next twelve months, we do not expect any such change would have a material effect on our financial condition, results of operations, or cash flows.