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Summarized Financial Data - Chevron U.S.A. Inc. (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total Revenues and Other Income [1]   $ 32,877   $ 64,401
Costs and other deductions $ 37,331 32,527 $ 70,022 62,819
Net income attributable to CUSA 3,409 1,450 7,047 4,132
Includes excise, value-added and similar taxes   1,771   3,448
Oil and Gas        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total Revenues and Other Income $ 40,491 $ 32,877 76,459 64,401
Chevron U.S.A. Inc.        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Costs and other deductions     58,782 49,592
Net income attributable to CUSA     1,806 775
Includes excise, value-added and similar taxes       2,130
Chevron U.S.A. Inc. | Oil and Gas        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total Revenues and Other Income     $ 60,298 $ 49,814
[1] The three-month and six-month comparative periods ended June 30, 2017, include excise, value-added and similar taxes of $1,771 million and $3,448 million, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with ASU 2014-09. Refer to Note 17, "Revenue" beginning on page 24.