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Product Warranty (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] The activity in warranty reserves is summarized in the following table. 
  Year ended December 31,
20202019
Beginning balance$$14 
Accrued to expense during the year
Reduced to other operating credits and charges— (4)
Payments made(2)(3)
Total warranty reserves
Current portion of warranty reserves(2)(2)
Long-term portion of warranty reserves$$