Income Taxes	3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our quarterly provision for income taxes is measured using an estimated annual effective tax rate, adjusted for discrete items within periods presented. The comparison of our effective tax rate between periods is significantly impacted by the level and mix of earnings and losses by tax jurisdiction, foreign income tax rate differentials and amount of permanent book-to-tax differences. The income tax provision for the three months ended March 31, 2015 was $13 million resulting in an effective tax rate of 17.3%, compared to $12 million resulting in an effective tax rate of 19.1% for the same period in 2014. The effective tax rate was lower than the United States federal statutory rate in each period primarily due to geographic mix of earnings. Unrecognized Tax Benefits We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement. The amount of unrecognized tax benefits at March 31, 2015 was $41 million which, if ultimately recognized, will reduce our annual effective tax rate. We do not believe that the unrecognized tax benefits will significantly change within the next twelve months. We classify interest expense relating to unrecognized tax benefits as a component of other non-operating expense, net and tax penalties as a component of income tax expense in our Condensed Consolidated Income Statements. As of March 31, 2015, we had less than $1 million of interest accrued for unrecognized tax benefits.

Income Taxes

3 Months Ended

Mar. 31, 2015

Our quarterly provision for income taxes is measured using an estimated annual effective tax rate, adjusted for discrete items within periods presented. The comparison of our effective tax rate between periods is significantly impacted by the level and mix of earnings and losses by tax jurisdiction, foreign income tax rate differentials and amount of permanent book-to-tax differences.

The income tax provision for the three months ended March 31, 2015 was $13 million resulting in an effective tax rate of 17.3%, compared to $12 million resulting in an effective tax rate of 19.1% for the same period in 2014. The effective tax rate was lower than the United States federal statutory rate in each period primarily due to geographic mix of earnings.

Unrecognized Tax Benefits

We recognize tax benefits from uncertain tax positions only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.

The amount of unrecognized tax benefits at March 31, 2015 was $41 million which, if ultimately recognized, will reduce our annual effective tax rate. We do not believe that the unrecognized tax benefits will significantly change within the next twelve months.

We classify interest expense relating to unrecognized tax benefits as a component of other non-operating expense, net and tax penalties as a component of income tax expense in our Condensed Consolidated Income Statements. As of March 31, 2015, we had less than $1 million of interest accrued for unrecognized tax benefits.