Income Taxes	9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective income tax rate for continuing operations was 25.9% and 30.7% for the three and nine months ended September 30, 2015, respectively, and 39.2% and 35.1% for the three and nine months ended September 30, 2014, respectively. Our effective income tax rate from continuing operations was lower than the prior periods as the result of the resolution of tax audits, increased income in lower tax rate jurisdictions, and the non-deductible tax treatment of certain regulatory charges incurred during 2014. At the end of each interim period, we estimate the annual effective tax rate and apply that rate to our ordinary quarterly earnings. The tax expense or benefit related to significant, unusual or extraordinary items that will be separately reported or reported net of their related tax effect, and are individually computed, is recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs. As of September 30, 2015 and December 31, 2014, the total amount of federal, state and local, and foreign unrecognized tax benefits was $122 million and $118 million, respectively, exclusive of interest and penalties. The increase in unrecognized tax benefits relates primarily to tax positions of prior years. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition, as of September 30, 2015 and December 31, 2014, we had $30 million and $23 million, respectively, of accrued interest and penalties associated with unrecognized tax benefits. Based on the current status of income tax audits, we believe that the total amount of unrecognized tax benefits may significantly decrease in the next twelve months. Although the ultimate resolution of our tax audits is unpredictable, the resulting change in our unrecognized tax benefits could have a material impact on our results of operations and/or cash flows.

Income Taxes

9 Months Ended

Sep. 30, 2015

The effective income tax rate for continuing operations was 25.9% and 30.7% for the three and nine months ended September 30, 2015, respectively, and 39.2% and 35.1% for the three and nine months ended September 30, 2014, respectively. Our effective income tax rate from continuing operations was lower than the prior periods as the result of the resolution of tax audits, increased income in lower tax rate jurisdictions, and the non-deductible tax treatment of certain regulatory charges incurred during 2014.

At the end of each interim period, we estimate the annual effective tax rate and apply that rate to our ordinary quarterly earnings. The tax expense or benefit related to significant, unusual or extraordinary items that will be separately reported or reported net of their related tax effect, and are individually computed, is recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs.

As of September 30, 2015 and December 31, 2014, the total amount of federal, state and local, and foreign unrecognized tax benefits was $122 million and $118 million, respectively, exclusive of interest and penalties. The increase in unrecognized tax benefits relates primarily to tax positions of prior years. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition, as of September 30, 2015 and December 31, 2014, we had $30 million and $23 million, respectively, of accrued interest and penalties associated with unrecognized tax benefits.

Based on the current status of income tax audits, we believe that the total amount of unrecognized tax benefits may significantly decrease in the next twelve months. Although the ultimate resolution of our tax audits is unpredictable, the resulting change in our unrecognized tax benefits could have a material impact on our results of operations and/or cash flows.