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Summarized Financial Data - Tengizchevroil LLP (Tables)
 9 Months Ended
Sep. 30, 2019
Summarized Financial Data of Affiliate [Abstract]  
Summarized Financial Data - Tengizchevroil LLP Summarized financial information for 100 percent of TCO is presented in the following table:
 
Nine Months Ended
September 30
 
2019
 
2018
 
(Millions of dollars)
Sales and other operating revenues
$
11,991

 
$
13,255

Costs and other deductions
5,971

 
5,780

Net income attributable to TCO
4,230

 
5,265