Income Taxes	9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the first quarter of 2014, a $135 million cash refund was received from the Internal Revenue Service (“IRS”) related to tax returns for the years ended December 31, 2008 and 2009. This refund was classified as a current income tax receivable at December 31, 2013. 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. In January 2014, we prospectively adopted guidance requiring unrecognized tax benefits to be presented as a reduction to any available deferred income tax asset for a net operating loss, a similar tax loss, or a tax credit carryforward. As a result of this guidance, $30 million of unrecognized tax benefits were recorded as a reduction to net current deferred income tax assets on the Condensed Consolidated Balance Sheets as of September 30, 2014. With regard to the APS Condensed Consolidated Balance Sheets, all unrecognized tax benefits are presented as a liability, as no deferred income tax assets for a net operating loss, a similar tax loss, or a tax credit carryforward are available to offset these liabilities as of September 30, 2014. As of September 30, 2014, the tax year ended December 31, 2010 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 2008.

Income Taxes

9 Months Ended

Sep. 30, 2014

During the first quarter of 2014, a $135 million cash refund was received from the Internal Revenue Service (“IRS”) related to tax returns for the years ended December 31, 2008 and 2009. This refund was classified as a current income tax receivable at December 31, 2013.

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.

In January 2014, we prospectively adopted guidance requiring unrecognized tax benefits to be presented as a reduction to any available deferred income tax asset for a net operating loss, a similar tax loss, or a tax credit carryforward. As a result of this guidance, $30 million of unrecognized tax benefits were recorded as a reduction to net current deferred income tax assets on the Condensed Consolidated Balance Sheets as of September 30, 2014. With regard to the APS Condensed Consolidated Balance Sheets, all unrecognized tax benefits are presented as a liability, as no deferred income tax assets for a net operating loss, a similar tax loss, or a tax credit carryforward are available to offset these liabilities as of September 30, 2014.

As of September 30, 2014, the tax year ended December 31, 2010 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 2008.