Uncertainties and Certain Significant Accounting Estimates	6 Months Ended
	Jun. 30, 2020
Unusual or Infrequent Items, or Both [Abstract]
UNCERTAINTIES AND CERTAIN SIGNIFICANT ACCOUNTING ESTIMATES (COVID-19)	2. UNCERTAINTIES AND CERTAIN SIGNIFICANT ACCOUNTING ESTIMATES Overview The outbreak of COVID-19 and its development into a pandemic in March 2020 and certain developments in the global oil markets have impacted and continue to impact our business. We responded, and will strive to continue to respond, to the impact from these matters on our business. We reduced the amount of crude oil processed at most of our refineries in response to the decreased demand for our products, we temporarily idled various gasoline-making units at certain of our refineries to further limit gasoline production, and we took measures to reduce jet fuel production. Eight of our ethanol plants were temporarily idled, and production at our remaining six ethanol plants was reduced earlier this year to address the decreased demand for ethanol. Demand for most of our products partially recovered during the latter part of the second quarter of 2020. As a result, we have increased the production of most of our products and recently restarted the gasoline-making units and four ethanol plants that had been temporarily idled. Many uncertainties remain with respect to COVID-19, including its resulting economic effects, and we are unable to predict the ultimate economic impacts from COVID-19 on our business and how quickly national economies can recover once the pandemic subsides, or whether any recovery will ultimately experience a reversal or other setbacks. However, the adverse impacts of the economic effects from COVID-19 and uncertainty in the global oil markets on our business have been and will likely continue to be significant. We believe we have proactively addressed many of the known impacts of COVID-19 to the extent possible and we will strive to continue to do so, but there can be no assurance that any measures we have taken or may take will be fully effective. As a result, we expect these matters may affect our estimates and assumptions on amounts reported in the financial statements and accompanying notes in the near term. Impairment Analysis of Long-Lived Assets Due to the adverse economic conditions discussed above, we reviewed our significant operating assets for the existence of impairment indicators. As a result of this review, we evaluated six ethanol plants for potential impairment as of June 30, 2020, assuming that we would operate these plants in the future and considering current economic conditions on our future estimated cash flows. Based on our analysis, we determined that the carrying amount of each of these plants was recoverable, as the undiscounted future cash flows from each plant exceeded its respective carrying value. Nonetheless, we will continue to evaluate the economic conditions and their impact on our assumptions. Impairment Analysis of Goodwill We have $260 million of goodwill as of June 30, 2020. All of our goodwill is allocated to one reporting unit, the U.S. Gulf Coast refining region. Our annual test for the impairment of goodwill is performed on October 1 of each year. However, as discussed above, there were adverse changes in the capital and commodity markets that contributed to a significant decline in our common stock price compared to the price as of December 31, 2019 and early March 2020. Despite the decline in our common stock price, we determined our goodwill was not impaired as of June 30, 2020. Nonetheless, we will continue to evaluate the economic conditions and their impact on our assumptions. Inventory Valuation See Note 4 regarding our $294 million LCM inventory valuation reserve and the estimates used to determine the market value of our inventories.