Income Taxes	6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective income tax rate was 32.3% and 31.9% for the three and six months ended June 30, 2016, respectively, and 32.6% and 32.4% for three and six months ended June 30, 2015, respectively. The decrease in the effective income tax rate was due to the resolution of tax audits and lower non-U.S. taxes. 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 June 30, 2016 and December 31, 2015, the total amount of federal, state and local, and foreign unrecognized tax benefits was $122 million and $120 million, respectively, exclusive of interest and penalties. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition, as of June 30, 2016 and December 31, 2015, we had $37 million and $31 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

6 Months Ended

Jun. 30, 2016

The effective income tax rate was 32.3% and 31.9% for the three and six months ended June 30, 2016, respectively, and 32.6% and 32.4% for three and six months ended June 30, 2015, respectively. The decrease in the effective income tax rate was due to the resolution of tax audits and lower non-U.S. taxes.

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 June 30, 2016 and December 31, 2015, the total amount of federal, state and local, and foreign unrecognized tax benefits was $122 million and $120 million, respectively, exclusive of interest and penalties. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition, as of June 30, 2016 and December 31, 2015, we had $37 million and $31 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.