Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended March 31, 2020 and 2019 was 4.4% and 148.2%, respectively. The effective tax rate for the three months ended March 31, 2020 includes a benefit of $2 million on the $198 million goodwill impairment charge as the majority of this charge is nondeductible. The effective tax rate also includes a benefit of $2 million from the resolution of certain tax examinations and a charge of $3 million for the write-off of deferred tax assets associated with the expiration of out-of-money vested stock options and the vesting of restricted stock. The effective tax rate for the three months ended March 31, 2019 includes a $2 million tax on the $18 million book loss incurred from Market Exits, primarily due to nondeductible basis differences. The effective tax rate for the three months ended March 31, 2019 also includes a benefit of $2 million from the resolution of certain tax examinations and a charge of $2 million for the write-off of deferred tax assets associated with the expiration of out-of-money vested stock options and the vesting of restricted stock. As is the case with other large corporations, our tax returns are examined 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 unrecognized tax benefits will decrease in the next 12 months, and this decrease could be up to 10% of our unrecognized tax benefits. The Internal Revenue Service examinations of our consolidated U.S. income tax returns for tax years prior to 2017 are closed to audit; however, various post-2011 U.S. state and local tax returns are still subject to examination. In Canada, the examination of our tax filings prior to 2015 are closed to audit. Other significant jurisdictions include France (closed through 2016), Germany (closed through 2016) and the U.K. (except for an item under appeal, closed through 2017). We also have other less significant tax filings currently subject to examination. On March 27, 2020, the Coronavirus Aid, Relief and Economic Security (CARES) Act was passed into law in response to market volatility and instability resulting from COVID-19. The CARES Act includes provisions relating to the deferment of the employer portion of certain payroll taxes, refundable payroll tax credits, net operating loss carryback periods, alternative minimum tax credit refunds and modifications to the net interest deduction limitations. We are currently assessing the impact on our consolidated financial statements, but do not expect it to be material.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.