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Schedule II—Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts Schedule II—Valuation and Qualifying Accounts
  Additions  
DescriptionBalance at
beginning
of period		Charges
to cost
and expenses		Charged
to other
accounts		DeductionsBalance at
end of period
Allowance for doubtful accounts:     
   Year ended December 31, 2021
$5 $— $— $— $5 
   Year ended December 31, 2020
4 1 — — 5 
   Year ended December 31, 2019
5 — — (1)4