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Employee Benefit Plans - Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Maximum annual increase percentage to company contribution for retiree medical coverage 4.00%    
Funded Status:      
Amounts recognized on a before-tax bases in "Accumulated other comprehensive loss" for the company's pension and other postretirement benefit plans $ 4,448 $ 5,286  
Net Actuarial Loss:      
The percentage of the higher of the projected benefit obligation or market-related value of plan assets in excess of which net actuarial losses are amortized 10.00%    
Other Benefit Assumptions:      
Assumed health care cost-trend rates in the next fiscal year 7.20% 7.40%  
Ultimate trend rate for health care cost 4.50% 4.50%  
Year when the ultimate health care cost trend rate is expected to be reached 2025 2025  
Primary Investment:      
Company's US and UK pension plans as a percentage of total pension assets 91.00%    
Benefit Plan Trusts:      
Number of Chevron treasury stocks held in benefit plan trust for funding obligations 14,168    
Various grantor trust assets invested primarily in interest earning accounts $ 34 $ 35  
Employee Incentive Plan      
Charges to expense for cash bonuses 1,048 936 $ 662
Other Benefits      
Funded Status:      
Amounts recognized on a before-tax bases in "Accumulated other comprehensive loss" for the company's pension and other postretirement benefit plans $ (312) $ (80)  
Net Actuarial Loss:      
Number of years net actuarial losses recorded in "Accumulated other comprehensive loss" at December 31 for the company's OPEB plans are being amortized for, over a straight-line basis 13 years    
Actuarial gain (loss) that will be amortized from Accumulated other comprehensive loss $ (3)    
Weighted average amortization period (in years) for recognizing prior service costs (credits) recorded in "Accumulated other comprehensive loss" at December 31 for other postretirement benefit plan 8 years    
Amortization of prior service (credits) costs during the next year $ (28)    
Discount Rate:      
Discount rate for pension plans 4.40% 3.80% 4.30%
Cash Contributions and Benefit Payments:      
Contributions to employee pension plans $ 166 $ 151  
Estimated contributions to employee pension plans for the next fiscal year 175    
ESIP      
Employee Savings Investment Plan:      
Compensation expense $ 270 $ 316 $ 281
U.S.      
Expected Return on Plan Assets:      
Estimated long-term rate of return on US pension plan assets 6.75% 6.75% 7.25%
Cash Contributions and Benefit Payments:      
Contributions to employee pension plans $ 803    
Estimated contributions to employee pension plans for the next fiscal year 700    
U.S. | Pension Benefits      
Funded Status:      
Amounts recognized on a before-tax bases in "Accumulated other comprehensive loss" for the company's pension and other postretirement benefit plans 3,701 $ 4,267  
Accumulated benefit obligations pension plans $ 10,514 $ 12,194  
Net Actuarial Loss:      
Number of years net actuarial losses recorded in "Accumulated other comprehensive loss" at December 31 for the company's US pension plans are being amortized for, over a straight-line basis 10 years    
Actuarial gain (loss) that will be amortized from Accumulated other comprehensive loss $ 239    
Company's estimated amount that will be recognized from "Accumulated other comprehensive loss" during the next year related to lump-sum settlement costs from U.S. pension plans $ 290    
Weighted average amortization period (in years) for recognizing prior service costs (credits) recorded in "Accumulated other comprehensive loss" at December 31 for US pension plan 4 years    
Amortization of prior service (credits) costs during the next year $ 2    
Expected Return on Plan Assets:      
Estimated long-term rate of return on US pension plan assets     7.50%
Percentage of US pension plan assets relative to total pension plan assets 67.00%    
Plan asset market valuation period, prior to year-end measurement date 3 months    
Discount Rate:      
Discount rate for pension plans 4.20% 3.50% 3.90%
Cash Contributions and Benefit Payments:      
Contributions to employee pension plans $ 803 $ 728  
U.S. | Pension Benefits | Equities | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 30.00%    
U.S. | Pension Benefits | Equities | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 60.00%    
U.S. | Pension Benefits | Fixed Income and Cash | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 20.00%    
U.S. | Pension Benefits | Fixed Income and Cash | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 65.00%    
U.S. | Pension Benefits | Real Estate | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 0.00%    
U.S. | Pension Benefits | Real Estate | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 15.00%    
U.S. | Pension Benefits | Other | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 0.00%    
U.S. | Pension Benefits | Other | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 15.00%    
U.S. | Other Benefits      
Discount Rate:      
Discount rate for pension plans 4.30% 3.60% 4.10%
Int’l.      
Expected Return on Plan Assets:      
Estimated long-term rate of return on US pension plan assets 5.50% 5.50% 6.30%
Cash Contributions and Benefit Payments:      
Contributions to employee pension plans $ 232    
Estimated contributions to employee pension plans for the next fiscal year 200    
Int’l. | Pension Benefits      
Funded Status:      
Amounts recognized on a before-tax bases in "Accumulated other comprehensive loss" for the company's pension and other postretirement benefit plans 1,059 $ 1,099  
Accumulated benefit obligations pension plans $ 4,360 $ 5,009  
Net Actuarial Loss:      
Number of years net actuarial losses recorded in "Accumulated other comprehensive loss" at December 31 for the company's international pension plans are being amortized for, over a straight-line basis 12 years    
Actuarial gain (loss) that will be amortized from Accumulated other comprehensive loss $ 19    
Weighted average amortization period (in years) for recognizing prior service costs (credits) recorded in "Accumulated other comprehensive loss" at December 31 for international pension plan 8 years    
Amortization of prior service (credits) costs during the next year $ 12    
Discount Rate:      
Discount rate for pension plans 4.40% 3.90% 4.30%
Cash Contributions and Benefit Payments:      
Contributions to employee pension plans $ 232 $ 252  
UNITED KINGDOM | Pension Benefits | Equities | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 25.00%    
UNITED KINGDOM | Pension Benefits | Equities | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 45.00%    
UNITED KINGDOM | Pension Benefits | Fixed Income and Cash | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 40.00%    
UNITED KINGDOM | Pension Benefits | Fixed Income and Cash | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 75.00%    
UNITED KINGDOM | Pension Benefits | Real Estate | Minimum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 5.00%    
UNITED KINGDOM | Pension Benefits | Real Estate | Maximum      
Primary Investment:      
Pension Plan - Board of Trustees approved asset allocation 15.00%