Income Taxes	3 Months Ended
Mar. 31, 2017
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes Income tax expense was $16 million for the three months ended March 31, 2017, compared to $46 million for the same period of the prior year. The effective income tax rate, expressed by calculating the income tax expense as a percentage of Income before income taxes, was 21.7% for the three months ended March 31, 2017 and differed from the US federal statutory rate primarily due to $12 million of excess tax benefits on equity compensation. The effective tax rate for the same period of the prior year was 37.2% and differed from the US federal statutory rate primarily due to state and local income taxes. The lower effective tax rate for the three months ended March 31, 2017 as compared to the same period of the prior year was primarily attributable to $12 million of excess tax benefits on equity compensation.

Income Taxes

3 Months Ended

Mar. 31, 2017

Income Taxes

Income tax expense was $16 million for the three months ended March 31, 2017, compared to $46 million for the same period of the prior year. The effective income tax rate, expressed by calculating the income tax expense as a percentage of Income before income taxes, was 21.7% for the three months ended March 31, 2017 and differed from the US federal statutory rate primarily due to $12 million of excess tax benefits on equity compensation. The effective tax rate for the same period of the prior year was 37.2% and differed from the US federal statutory rate primarily due to state and local income taxes. The lower effective tax rate for the three months ended March 31, 2017 as compared to the same period of the prior year was primarily attributable to $12 million of excess tax benefits on equity compensation.