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Other Contingencies and Commitments (Details)
Sep. 30, 2020
legal_matter
Dec. 31, 2009
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Indemnifications acquirer environmental liabilities max obligation | $   $ 200,000,000
Louisiana | All Companies Served With Claim    
Reserve Quantities [Line Items]    
Pending lawsuits and claims (in number of claims) 43  
Louisiana | Chevron U.S.A. Inc.    
Reserve Quantities [Line Items]    
Pending lawsuits and claims (in number of claims) 39