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Investments and Advances - Summary of Financial Information of All Equity Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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