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Investments and Advances - Summary of Financial Information of All Equity Affiliates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Chevron      
Schedule of Investments [Line Items]      
Total revenues $ 40,679 $ 33,460 $ 27,787
Income before income tax expense 6,755 5,712 3,670
Net income attributable to affiliates 6,384 4,468 2,876
Current assets 12,813 13,568 13,743
Noncurrent assets 36,369 32,643 28,854
Current liabilities 9,843 10,201 8,996
Noncurrent liabilities 4,446 4,224 4,255
Total affiliates' net equity 34,893 31,786 29,346
Affiliates      
Schedule of Investments [Line Items]      
Total revenues 84,469 70,744 59,253
Income before income tax expense 16,693 13,487 6,587
Net income attributable to affiliates 13,321 10,751 5,127
Current assets 32,657 33,883 33,406
Noncurrent assets 87,614 82,261 75,258
Current liabilities 26,006 26,873 24,793
Noncurrent liabilities 20,000 21,447 22,671
Total affiliates' net equity $ 74,265 $ 67,824 $ 61,200