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Equity Investments	12 Months Ended
Equity Investments	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Investments	Equity Investments Our equity investments in unconsolidated affiliates were $62 million and $66 million for the years ended December 31, 2017 and 2016, respectively. Equity in losses of unconsolidated affiliates for the year ended December 31, 2017 totaled $3 million and equity in earnings of unconsolidated affiliates for the years ended December 31, 2016 and 2015 totaled $2 million and $3 million, respectively. During 2015, we determined that the fair values of certain equity investments were significantly below their carrying values. We assessed these declines in value to be other than temporary and recognized an impairment loss of $25 million. See “Note 14 – Fair Value of Financial Instruments, Assets and Equity Investments” for additional information regarding the fair value determination.