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Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues [1] $ 134,674 $ 110,215 $ 129,925
Total costs and other deductions 132,501 116,632 133,635
Net income (loss) attributable to CUSA 9,195 (497) 4,587
Chevron U.S.A. Inc.      
Subsidiary Statements Captions [Line Items]      
Sales and other operating revenues 104,054 83,715 97,766
Total costs and other deductions 103,904 87,429 101,565
Net income (loss) attributable to CUSA $ 4,842 $ (1,177) $ (1,054)
[1] Includes excise, value-added and similar taxes. $7,189; $6,905; $7,359.