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Other Investments Other Investments (Notes)	6 Months Ended
Other Investments Other Investments (Notes)	Jun. 30, 2020
Other Investments [Abstract]
Cost and Equity Method Investments Disclosure [Text Block]	OTHER INVESTMENTS We have investments in entities not accounted for under the equity method for which fair values are not readily available. We record these investments at cost (less impairment, if any), adjusted for observable price changes in orderly transactions for the identical or a similar investment of the same issuer. We report the carrying value of these investments in Other assets in the non-current assets section of our consolidated balance sheets. These investments were $1.2 billion and $1.6 billion at December 31, 2019 and June 30, 2020, respectively. The increase from December 31, 2019 primarily reflects our preferred security investment in Argo AI. See Note 17 for additional information relating to our Argo AI and VW transaction. In the second quarter of 2020, there were no material adjustments to the fair values of these investments held at June 30, 2020.