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Asset Impairments and Unusual Items	3 Months Ended
Asset Impairments and Unusual Items	Mar. 31, 2019
Asset Impairments and Unusual Items
Asset Impairments and Unusual Items	10. Asset Impairments During the three months ended March 31, 2019, we recognized in Other, net a $52 million impairment charge related to our minority-owned investment in a waste conversion technology business. We wrote down our investment to its estimated fair value as the result of recent third-party investor’s transactions in these securities. The fair value of our investment was not readily determinable; thus, we determined the fair value utilizing a combination of quoted price inputs for the equity in our investment (Level 2) and certain management assumptions pertaining to investment value (Level 3).