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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Summarized Financial Data - Chevron Transport Corporation      
Costs and other deductions $ 27,356 $ 31,243  
Net income attributable to TCO $ 3,599 $ 2,649  
Chevron Phillips Chemical Company LLC      
Affiliate Statements Captions [Line Items]      
Percentage of affiliate by summarized financial information 100.00%    
Summarized Financial Data - Chevron Transport Corporation      
Costs and other deductions $ 1,812   $ 2,004
Net income attributable to TCO 337   449
Chevron Phillips Chemical Company LLC | Oil and Gas      
Summarized Financial Data - Chevron Transport Corporation      
Total Revenues and Other Income $ 2,195   $ 2,377
Chevron Phillips Chemical Company LLC      
Affiliate Statements Captions [Line Items]      
Equity method investment, ownership percentage 50.00%