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Committments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Loss Contingencies by Contingency [Table Text Block] maintain reserves for various contingent liabilities as follows:
 December 31,
20202019
Environmental reserves$14 $10 
Other reserves— — 
Total contingencies14 10 
Current portion(1)(2)
Long-term portion$13 $8 
Schedule of Environmental Loss Contingencies by Site [Table Text Block]
The activity in our reserve for estimated environmental loss contingency reserves is summarized in the following table.
  
Year ended December 31,
20202019
Beginning balance$10 $11 
Adjustments to expense during the year2 1 
Adjustments to amounts to be paid be paid by a third party2 — 
Payments made (1)(1)
Ending balance$13 $10