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Commiments and Contingencies Commiments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Legal and Environmental Matters [Abstract]  
Schedule of Loss Contingencies by Contingency [Table Text Block]
We maintain reserves for various contingent liabilities as follows:
September 30, 2021December 31, 2020
Environmental reserves$14 $14 
Other reserves— — 
Total contingencies14 14 
Current portion (included in Accrued liabilities)(1)(1)
Long-term portion (included in Other long-term liabilities)$13 $13