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Other Investments Other Investments (Notes)	6 Months Ended
Other Investments Other Investments (Notes)	Jun. 30, 2019
Other Investments [Abstract]
Cost and Equity Method Investments Disclosure [Text Block]	OTHER INVESTMENTS We have investments in entities for which we do not have the ability to exercise significant influence and 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 sheet. These investments were $250 million and $727 million at December 31, 2018 and June 30, 2019, respectively. The increase from December 31, 2018 primarily reflects the $500 million investment in Rivian we made during the second quarter of 2019. In the first half of 2019, there were no material adjustments to the fair values of these investments held at June 30, 2019.