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Summarized Financial Data - Tengizchevroil LLP (Tables)
 3 Months Ended
Mar. 31, 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:
 
Three Months Ended
March 31
 
2019
 
2018
 
(Millions of dollars)
Sales and other operating revenues
$
4,107

 
$
4,325

Costs and other deductions
2,002

 
1,942

Net income attributable to TCO
1,481

 
1,679