Income Taxes	6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended June 30, 2017 and 2016 was 9.2% and 35.8%, respectively, and the effective tax rate for the six months ended June 30, 2017 and 2016 was 24.2% and 36.5%, respectively. The effective tax rate for the six months ended June 30, 2017 and 2016 includes a $4 million and $3 million charge, respectively, from the write-off of deferred tax assets associated with the expiration of out-of-the-money vested stock options and the vesting of restricted stock. The effective tax rate for the three and six months ended June 30, 2017 includes a $10 million and $14 million benefit, respectively, from the resolution of tax examinations. As is the case with other large corporations, our tax returns are examined each year by tax authorities in the U.S. and other global taxing jurisdictions in which we have operations. As a result, it is reasonably possible that the amount of our unrecognized tax benefits will decrease in the next 12 months, and we expect this change could be up to 15% of our unrecognized tax benefits. The IRS examinations of our consolidated U.S. income tax returns for tax years prior to 2012 are closed to audit; however, various post-2006 U.S. state and local tax returns are still subject to examination. In Canada, the examination of our tax filings prior to 2012 are closed to audit, except for the pending application of legal principles to specific issues arising in earlier years. Other significant jurisdictions include France, which is closed to audit through the end of 2012, Germany, which is closed to audit through the end of 2011 and the U.K., which, except for an item under appeal, is closed to audit through the end of 2011. We have other less significant tax filings currently subject to examination.

Income Taxes

The effective tax rate for the three months ended June 30, 2017 and 2016 was 9.2% and 35.8%, respectively, and the effective tax rate for the six months ended June 30, 2017 and 2016 was 24.2% and 36.5%, respectively. The effective tax rate for the six months ended June 30, 2017 and 2016 includes a $4 million and $3 million charge, respectively, from the write-off of deferred tax assets associated with the expiration of out-of-the-money vested stock options and the vesting of restricted stock. The effective tax rate for the three and six months ended June 30, 2017 includes a $10 million and $14 million benefit, respectively, from the resolution of tax examinations.

As is the case with other large corporations, our tax returns are examined each year by tax authorities in the U.S. and other global taxing jurisdictions in which we have operations. As a result, it is reasonably possible that the amount of our unrecognized tax benefits will decrease in the next 12 months, and we expect this change could be up to 15% of our unrecognized tax benefits.

The IRS examinations of our consolidated U.S. income tax returns for tax years prior to 2012 are closed to audit; however, various post-2006 U.S. state and local tax returns are still subject to examination. In Canada, the examination of our tax filings prior to 2012 are closed to audit, except for the pending application of legal principles to specific issues arising in earlier years. Other significant jurisdictions include France, which is closed to audit through the end of 2012, Germany, which is closed to audit through the end of 2011 and the U.K., which, except for an item under appeal, is closed to audit through the end of 2011. We have other less significant tax filings currently subject to examination.