Income Taxes	9 Months Ended
Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income taxes	Income Taxes As of December 31, 2013, we had $656 million of unrecognized tax benefits, of which $500 million would reduce income tax expense and the effective tax rate, if recognized. 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 $227 million. However, this amount may change because we continue to have ongoing negotiations with various taxing authorities throughout the year. We have received reassessments from the Canada Revenue Agency (“CRA”) for a total of $210 million related to a transfer pricing matter impacting years 2003 through 2008. Payments of approximately $156 million of these reassessments have been made to the CRA to stop the accrual of interest. In prior years, we appealed the reassessment for 2003 to the Tax Court of Canada and filed a notice of objection for 2004 through 2008. On December 13, 2013, the Tax Court of Canada dismissed our appeal of the reassessment with respect to 2003. On January 10, 2014, we filed a Notice of Appeal to the Federal Court of Appeal from the judgment of the Tax Court of Canada. As a result of the unfavorable Tax Court Decision relating to 2003, we recognized a discrete tax charge of $122 million in the quarter, which includes tax and interest for the years 2003 through 2013. The ultimate resolution of these issues could result in an increase or decrease to income tax expense. We have received tax assessments of $98 million from the U.S. Internal Revenue Service (“IRS”) relating to 2003 through 2006. We disagree with a substantial portion of the tax assessments primarily relating to transfer pricing. We are pursuing administrative relief through the appeals process. We continue to believe in the merits of our tax positions and that we have adequately provided for any potential adverse results relating to these examinations in our financial statements. The IRS is currently examining our U.S. corporation income tax returns for 2007 through 2009. The CRA is currently examining our Canadian income tax returns for 2009 through 2013. In nearly all jurisdictions, the tax years prior to 2003 are no longer subject to examination. We report interest and penalties on tax deficiencies as income tax expense. At December 31, 2013, before any tax benefits, our accrued interest and penalties on unrecognized tax benefits amounted to $180 million. We recognized an income tax expense of $44 million and $50 million, before any tax benefit, related to interest and penalties in our condensed consolidated statements of operations during the third quarter and first nine months of 2014.

Income Taxes

As of December 31, 2013, we had $656 million of unrecognized tax benefits, of which $500 million would reduce income tax expense and the effective tax rate, if recognized. 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 $227 million. However, this amount may change because we continue to have ongoing negotiations with various taxing authorities throughout the year.

We have received reassessments from the Canada Revenue Agency (“CRA”) for a total of $210 million related to a transfer pricing matter impacting years 2003 through 2008. Payments of approximately $156 million of these reassessments have been made to the CRA to stop the accrual of interest. In prior years, we appealed the reassessment for 2003 to the Tax Court of Canada and filed a notice of objection for 2004 through 2008. On December 13, 2013, the Tax Court of Canada dismissed our appeal of the reassessment with respect to 2003. On January 10, 2014, we filed a Notice of Appeal to the Federal Court of Appeal from the judgment of the Tax Court of Canada. As a result of the unfavorable Tax Court Decision relating to 2003, we recognized a discrete tax charge of $122 million in the quarter, which includes tax and interest for the years 2003 through 2013. The ultimate resolution of these issues could result in an increase or decrease to income tax expense.

We have received tax assessments of $98 million from the U.S. Internal Revenue Service (“IRS”) relating to 2003 through 2006. We disagree with a substantial portion of the tax assessments primarily relating to transfer pricing. We are pursuing administrative relief through the appeals process. We continue to believe in the merits of our tax positions and that we have adequately provided for any potential adverse results relating to these examinations in our financial statements.

The IRS is currently examining our U.S. corporation income tax returns for 2007 through 2009. The CRA is currently examining our Canadian income tax returns for 2009 through 2013. In nearly all jurisdictions, the tax years prior to 2003 are no longer subject to examination.

We report interest and penalties on tax deficiencies as income tax expense. At December 31, 2013, before any tax benefits, our accrued interest and penalties on unrecognized tax benefits amounted to $180 million. We recognized an income tax expense of $44 million and $50 million, before any tax benefit, related to interest and penalties in our condensed consolidated statements of operations during the third quarter and first nine months of 2014.