Income Taxes	6 Months Ended
May 06, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the fiscal quarter and two fiscal quarters ended May 6, 2018, our benefit from income taxes was $2,637 million and $8,423 million, respectively, compared to $103 million and $93 million for the fiscal quarter and two fiscal quarters ended April 30, 2017, respectively. The benefit for the fiscal quarter ended May 6, 2018 included the impact from the April 4, 2018 completion of the Redomiciliation Transaction and related internal reorganizations. The impact included tax benefits from the reduction of $1,063 million in unrecognized federal tax benefits related to a one-time transition tax, or the Transition Tax, $431 million in the Transition Tax payable and $1,162 million from the remeasurement of withholding taxes on undistributed earnings, partially offset by a $91 million tax provision on foreign earnings and profit subject to U.S. tax. The benefit from income taxes in the two fiscal quarters ended May 6, 2018 was principally a result of provisional income tax benefits realized from the enactment of the 2017 Tax Reform Act on December 22, 2017 and included the net deferred tax liabilities established in connection with the Brocade Merger. The 2017 Tax Reform Act makes significant changes to the U.S. Internal Revenue Code, including, but not limited to, a decrease in the U.S. corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S. international taxation from a worldwide tax system to a participation exemption regime, and the Transition Tax on the mandatory deemed repatriation of accumulated non-U.S. earnings of U.S. controlled foreign corporations as of December 31, 2017. On December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118, or SAB 118, to address the application of GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the 2017 Tax Reform Act. Based on our interpretation of the 2017 Tax Reform Act and available guidance, including SAB 118, we recorded a total provisional benefit of $7,303 million, which we believe was a reasonable estimate as of May 6, 2018. The provisional benefit includes $92 million related to the remeasurement of certain deferred tax assets and liabilities, which was based on the tax rates at which they are expected to be reversed in the future as a result of the 2017 Tax Reform Act. The provisional benefit also includes $7,212 million related to the Transition Tax, which was primarily due to a reduction of $10,392 million in our federal deferred income tax liabilities on accumulated non-U.S. earnings, partially offset by $2,116 million of federal provisional long-term Transition Tax payable and $1,116 million of unrecognized federal tax benefits related to the Transition Tax. The provisional benefit includes a $1,494 million reduction of the Transition Tax in the fiscal quarter ended May 6, 2018 primarily as a result of the completion of the Redomiciliation Transaction and related internal reorganizations. Additional detailed analysis of historical foreign earnings, as well as potential correlative adjustments is ongoing. Any subsequent adjustment to these amounts, which must be completed within 12 months of the enactment of the 2017 Tax Reform Act, will be recorded as a discrete adjustment to provision for (benefit from) income taxes in the period in which the analysis is complete. In connection with the Brocade Merger, we established $845 million of net deferred tax liabilities on the excess of book basis over the tax basis of acquired identified intangible assets and investments in certain foreign subsidiaries that have not been indefinitely reinvested, partially offset by acquired tax attributes. The net deferred tax liabilities are based upon certain assumptions underlying our preliminary purchase price allocation. Upon finalization of the purchase price allocation, additional adjustments to the amount of our net deferred taxes may be required, provided we are within the measurement period. We also recognized discrete benefits from the recognition of $127 million and $155 million of excess tax benefits from stock-based awards that were vested and/or exercised during the fiscal quarter and two fiscal quarters ended May 6, 2018, respectively. The benefit from income taxes in the corresponding 2017 fiscal periods was primarily due to a discrete benefit from the recognition of $139 million and $181 million of excess tax benefits from stock-based awards that were vested and/or exercised during the fiscal quarter and two fiscal quarters ended April 30, 2017, respectively. Uncertain Tax Positions The balance of gross unrecognized tax benefits was $3,430 million and $2,256 million as of May 6, 2018 and October 29, 2017, respectively. Gross unrecognized tax benefits increased by $1,174 million compared to the balance as of October 29, 2017, primarily due to the recognition of uncertain tax positions related to the Transition Tax and to a lesser extent, the Brocade Merger, which were initially estimated as of the Brocade Acquisition Date. We continue to reevaluate these items with any adjustments to our preliminary estimates recognized, provided we are within the measurement period and we continue to collect information in order to determine their estimated values. Accrued interest and penalties are included in other long-term liabilities on the condensed consolidated balance sheets. As of May 6, 2018 and October 29, 2017, the combined amount of cumulative accrued interest and penalties was approximately $155 million and $132 million, respectively. A portion of our unrecognized tax benefits will affect our effective tax rate if they are recognized upon favorable resolution of the uncertain tax positions. As of May 6, 2018 and October 29, 2017, approximately $3,586 million and $2,388 million, respectively, of the unrecognized tax benefits, including accrued interest and penalties, would affect our effective tax rate if favorably resolved. We are subject to U.S. income tax examination for fiscal years 2010 and later. Certain of our acquired companies are subject to tax examinations in major jurisdictions outside the United States for fiscal years 2013 and later. It is possible that our existing unrecognized tax benefits may change by up to $257 million as a result of lapses of statutes of limitations for certain audit periods and/or audit examinations expected to be completed within the next 12 months.

Income Taxes

For the fiscal quarter and two fiscal quarters ended May 6, 2018, our benefit from income taxes was $2,637 million and $8,423 million, respectively, compared to $103 million and $93 million for the fiscal quarter and two fiscal quarters ended April 30, 2017, respectively.

The benefit for the fiscal quarter ended May 6, 2018 included the impact from the April 4, 2018 completion of the Redomiciliation Transaction and related internal reorganizations. The impact included tax benefits from the reduction of $1,063 million in unrecognized federal tax benefits related to a one-time transition tax, or the Transition Tax, $431 million in the Transition Tax payable and $1,162 million from the remeasurement of withholding taxes on undistributed earnings, partially offset by a $91 million tax provision on foreign earnings and profit subject to U.S. tax.

The benefit from income taxes in the two fiscal quarters ended May 6, 2018 was principally a result of provisional income tax benefits realized from the enactment of the 2017 Tax Reform Act on December 22, 2017 and included the net deferred tax liabilities established in connection with the Brocade Merger.

The 2017 Tax Reform Act makes significant changes to the U.S. Internal Revenue Code, including, but not limited to, a decrease in the U.S. corporate tax rate from 35% to 21% effective for tax years beginning after December 31, 2017, the transition of U.S. international taxation from a worldwide tax system to a participation exemption regime, and the Transition Tax on the mandatory deemed repatriation of accumulated non-U.S. earnings of U.S. controlled foreign corporations as of December 31, 2017.

On December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118, or SAB 118, to address the application of GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the 2017 Tax Reform Act.

Based on our interpretation of the 2017 Tax Reform Act and available guidance, including SAB 118, we recorded a total provisional benefit of $7,303 million, which we believe was a reasonable estimate as of May 6, 2018. The provisional benefit includes $92 million related to the remeasurement of certain deferred tax assets and liabilities, which was based on the tax rates at which they are expected to be reversed in the future as a result of the 2017 Tax Reform Act. The provisional benefit also includes $7,212 million related to the Transition Tax, which was primarily due to a reduction of $10,392 million in our federal deferred income tax liabilities on accumulated non-U.S. earnings, partially offset by $2,116 million of federal provisional long-term Transition Tax payable and $1,116 million of unrecognized federal tax benefits related to the Transition Tax. The provisional benefit includes a $1,494 million reduction of the Transition Tax in the fiscal quarter ended May 6, 2018 primarily as a result of the completion of the Redomiciliation Transaction and related internal reorganizations. Additional detailed analysis of historical foreign earnings, as well as potential correlative adjustments is ongoing. Any subsequent adjustment to these amounts, which must be completed within 12 months of the enactment of the 2017 Tax Reform Act, will be recorded as a discrete adjustment to provision for (benefit from) income taxes in the period in which the analysis is complete.

In connection with the Brocade Merger, we established $845 million of net deferred tax liabilities on the excess of book basis over the tax basis of acquired identified intangible assets and investments in certain foreign subsidiaries that have not been indefinitely reinvested, partially offset by acquired tax attributes. The net deferred tax liabilities are based upon certain assumptions underlying our preliminary purchase price allocation. Upon finalization of the purchase price allocation, additional adjustments to the amount of our net deferred taxes may be required, provided we are within the measurement period.

We also recognized discrete benefits from the recognition of $127 million and $155 million of excess tax benefits from stock-based awards that were vested and/or exercised during the fiscal quarter and two fiscal quarters ended May 6, 2018, respectively.

The benefit from income taxes in the corresponding 2017 fiscal periods was primarily due to a discrete benefit from the recognition of $139 million and $181 million of excess tax benefits from stock-based awards that were vested and/or exercised during the fiscal quarter and two fiscal quarters ended April 30, 2017, respectively.

Uncertain Tax Positions

The balance of gross unrecognized tax benefits was $3,430 million and $2,256 million as of May 6, 2018 and October 29, 2017, respectively. Gross unrecognized tax benefits increased by $1,174 million compared to the balance as of October 29, 2017, primarily due to the recognition of uncertain tax positions related to the Transition Tax and to a lesser extent, the Brocade Merger, which were initially estimated as of the Brocade Acquisition Date. We continue to reevaluate these items with any adjustments to our preliminary estimates recognized, provided we are within the measurement period and we continue to collect information in order to determine their estimated values.

Accrued interest and penalties are included in other long-term liabilities on the condensed consolidated balance sheets. As of May 6, 2018 and October 29, 2017, the combined amount of cumulative accrued interest and penalties was approximately $155 million and $132 million, respectively.

A portion of our unrecognized tax benefits will affect our effective tax rate if they are recognized upon favorable resolution of the uncertain tax positions. As of May 6, 2018 and October 29, 2017, approximately $3,586 million and $2,388 million, respectively, of the unrecognized tax benefits, including accrued interest and penalties, would affect our effective tax rate if favorably resolved.

We are subject to U.S. income tax examination for fiscal years 2010 and later. Certain of our acquired companies are subject to tax examinations in major jurisdictions outside the United States for fiscal years 2013 and later. It is possible that our existing unrecognized tax benefits may change by up to $257 million as a result of lapses of statutes of limitations for certain audit periods and/or audit examinations expected to be completed within the next 12 months.