Income Taxes	9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On September 13, 2013, the U.S. Treasury Department released final income tax regulations on the deduction and capitalization of expenditures related to tangible property. These final regulations apply to tax years beginning on or after January 1, 2014. Several of the provisions within the regulations required a tax accounting method change which was filed with the IRS on September 11, 2015. The impact of these final regulations was materially consistent with the estimated tax-effected cumulative effect adjustment of approximately $82 million that was accounted for as a reduction to net deferred income taxes in the Condensed Consolidated Balance Sheets as of December 31, 2014. Net income associated with the Palo Verde sale leaseback variable interest entities is not subject to tax (see Note 6). As a result, there is no income tax expense associated with the VIEs recorded on the Condensed Consolidated Statements of Income. As of September 30, 2015, the tax year ended December 31, 2012 and all subsequent tax years remain subject to examination by the IRS. With few exceptions, we are no longer subject to state income tax examinations by tax authorities for years before 2009.

Income Taxes

9 Months Ended

Sep. 30, 2015

On September 13, 2013, the U.S. Treasury Department released final income tax regulations on the deduction and capitalization of expenditures related to tangible property. These final regulations apply to tax years beginning on or after January 1, 2014. Several of the provisions within the regulations required a tax accounting method change which was filed with the IRS on September 11, 2015. The impact of these final regulations was materially consistent with the estimated tax-effected cumulative effect adjustment of approximately $82 million that was accounted for as a reduction to net deferred income taxes in the Condensed Consolidated Balance Sheets as of December 31, 2014.

Net income associated with the Palo Verde sale leaseback variable interest entities is not subject to tax (see Note 6). As a result, there is no income tax expense associated with the VIEs recorded on the Condensed Consolidated Statements of Income.

As of September 30, 2015, the tax year ended December 31, 2012 and all subsequent tax years remain subject to examination by the IRS. With few exceptions, we are no longer subject to state income tax examinations by tax authorities for years before 2009.