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Litigation (Details) - Pending Litigation
$ in Millions
1 Months Ended
Feb. 28, 2011
USD ($)
Sep. 30, 2021
legal_matter
MTBE    
Loss Contingencies [Line Items]    
Pending lawsuits and claims (in number of claims) | legal_matter   6
Ecuador    
Loss Contingencies [Line Items]    
Amount assessed in damages | $ $ 9,500