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Other Noncurrent Assets
 12 Months Ended
Dec. 31, 2021
Other Assets, Noncurrent Disclosure [Abstract]  
Other Noncurrent Assets Other Noncurrent AssetsOther noncurrent assets at December 31, 2021 and 2020 consisted of the following:
  December 31,
 20212020
Pension assets$172 $124 
Spare parts inventory32 35 
Debt issuance costs4 2 
Total$208 $161