Income Taxes	6 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the second quarters of 2016 and 2015, income tax expense related to continuing operations was $244 million and $223 million and included net discrete tax benefits of $24 million and $6 million. During the first six months of 2016 and 2015, income tax expense related to continuing operations was $500 million and $408 million and included net discrete tax benefits of $29 million and $18 million. Our reported income tax rates for the second quarters of 2016 and 2015 were 27.7% and 31.2% and for the first six months of 2016 and 2015 were 28.8% and 31.0%. The fluctuations in our reported income tax rates are primarily due to changes within our business mix, including varying proportions of income attributable to foreign countries that have lower income tax rates and discrete items. During the second quarter of 2016, we evaluated the recent U.S. Tax Court’s decision in Altera Corp. v. Commissioner related to the treatment of stock-based compensation expense in an intercompany cost-sharing agreement and recognized a discrete tax benefit of $25 million based on our historical tax filing position. As of September 30, 2015, we had $548 million of unrecognized tax benefits, of which $374 million would reduce income tax expense and the effective tax rate, if recognized. As of June 30, 2015, we had $497 million of unrecognized tax benefits, of which $337 million would reduce income tax expense and the effective tax rate, if recognized. The increase in unrecognized tax benefits for the quarter mainly relates to the filing of a refund claim with the state of California. During the next twelve months, it is reasonably possible that audit resolutions and the expiration of statutes of limitations could potentially reduce our unrecognized tax benefits by up to $124 million. However, this amount may change as we continue to have ongoing negotiations with various taxing authorities throughout the year. We report interest and penalties on tax deficiencies as income tax expense. We recognized income tax benefit of $1 million and income tax expense of $3 million during the second quarters of 2016 and 2015 and income tax expense of $5 million and $7 million during the first six months of 2016 and 2015, before any tax benefit, related to interest and penalties in our condensed consolidated statements of operations. At September 30, 2015 and 2014, before any tax benefits, our accrued interest and penalties on unrecognized tax benefits amounted to $75 million and $161 million. We file income tax returns in the U.S. federal jurisdiction, various U.S. state jurisdictions and various foreign jurisdictions. During the first quarter of 2015, we reached an agreement with the Internal Revenue Service (“IRS”) to settle all outstanding issues relating to years 2003 through 2006 and recognized a discrete tax benefit of $17 million to record a previously unrecognized tax benefit. The IRS is currently examining our U.S. corporation income tax returns for 2007 through 2009 and may issue a Revenue Agent Report before the end of our fiscal year 2016. We previously received reassessments from the Canada Revenue Agency (“CRA”) related to a transfer pricing matter impacting years 2003 through 2010. On December 13, 2013, the Tax Court of Canada dismissed our appeal of the 2003 reassessment and we filed a Notice of Appeal to the Federal Court of Appeal. During the first quarter of 2016, we reached an agreement to settle the transfer pricing matter for years 2003 through 2010 and recorded a discrete income tax benefit of $12 million for a previously unrecognized tax benefit. The CRA is currently examining our Canadian income tax returns for years 2011 through 2013.

Income Taxes

During the second quarters of 2016 and 2015, income tax expense related to continuing operations was $244 million and $223 million and included net discrete tax benefits of $24 million and $6 million. During the first six months of 2016 and 2015, income tax expense related to continuing operations was $500 million and $408 million and included net discrete tax benefits of $29 million and $18 million. Our reported income tax rates for the second quarters of 2016 and 2015 were 27.7% and 31.2% and for the first six months of 2016 and 2015 were 28.8% and 31.0%. The fluctuations in our reported income tax rates are primarily due to changes within our business mix, including varying proportions of income attributable to foreign countries that have lower income tax rates and discrete items.

During the second quarter of 2016, we evaluated the recent U.S. Tax Court’s decision in Altera Corp. v. Commissioner related to the treatment of stock-based compensation expense in an intercompany cost-sharing agreement and recognized a discrete tax benefit of $25 million based on our historical tax filing position.

As of September 30, 2015, we had $548 million of unrecognized tax benefits, of which $374 million would reduce income tax expense and the effective tax rate, if recognized. As of June 30, 2015, we had $497 million of unrecognized tax benefits, of which $337 million would reduce income tax expense and the effective tax rate, if recognized. The increase in unrecognized tax benefits for the quarter mainly relates to the filing of a refund claim with the state of California. During the next twelve months, it is reasonably possible that audit resolutions and the expiration of statutes of limitations could potentially reduce our unrecognized tax benefits by up to $124 million. However, this amount may change as we continue to have ongoing negotiations with various taxing authorities throughout the year.

We report interest and penalties on tax deficiencies as income tax expense. We recognized income tax benefit of $1 million and income tax expense of $3 million during the second quarters of 2016 and 2015 and income tax expense of $5 million and $7 million during the first six months of 2016 and 2015, before any tax benefit, related to interest and penalties in our condensed consolidated statements of operations. At September 30, 2015 and 2014, before any tax benefits, our accrued interest and penalties on unrecognized tax benefits amounted to $75 million and $161 million.

We file income tax returns in the U.S. federal jurisdiction, various U.S. state jurisdictions and various foreign jurisdictions. During the first quarter of 2015, we reached an agreement with the Internal Revenue Service (“IRS”) to settle all outstanding issues relating to years 2003 through 2006 and recognized a discrete tax benefit of $17 million to record a previously unrecognized tax benefit. The IRS is currently examining our U.S. corporation income tax returns for 2007 through 2009 and may issue a Revenue Agent Report before the end of our fiscal year 2016.

We previously received reassessments from the Canada Revenue Agency (“CRA”) related to a transfer pricing matter impacting years 2003 through 2010. On December 13, 2013, the Tax Court of Canada dismissed our appeal of the 2003 reassessment and we filed a Notice of Appeal to the Federal Court of Appeal. During the first quarter of 2016, we reached an agreement to settle the transfer pricing matter for years 2003 through 2010 and recorded a discrete income tax benefit of $12 million for a previously unrecognized tax benefit. The CRA is currently examining our Canadian income tax returns for years 2011 through 2013.