Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective income tax rate was 21.7% and 21.6% for the three and nine months ended September 30, 2020, respectively, and 22.2% and 21.9% for the three and nine months ended September 30, 2019, respectively. The decrease in the three months ended September 30, 2020 was primarily due to taxes on the deductible pre-tax loss on extinguishment of debt related to the redemption and extinguishment of our 4.4% senior notes due in 2026 and a portion of the 6.55% senior notes due in 2037 and 4.5% senior notes due in 2048 in the third quarter of 2020. The decrease in the nine months ended September 30, 2020 was primarily due to a decrease in taxes on foreign operations. 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 infrequently occurring 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. The Company is continuously subject to tax examinations in various jurisdictions. As of September 30, 2020 and December 31, 2019, the total amount of federal, state and local, and foreign unrecognized tax benefits was $131 million and $124 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. As of September 30, 2020 and December 31, 2019, we had $23 million and $20 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 decrease by approximately $12 million in the next twelve months as a result of the resolution of local tax examinations.

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.