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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | $ 7,278 | $ 6,357 |  |
Other Benefit Assumptions: |  |  |  |
Assumed health care cost-trend rates in the next fiscal year | 6.10% | 6.80% |  |
Ultimate trend rate for health care cost | 4.50% | 4.50% |  |
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 | 14,168,000 | 14,168,000 | 14,168,000 | 14,168,000
Various grantor trust assets invested primarily in interest earning accounts | $ 36 | $ 35 |  |
Employee Incentive Plan |  |  |  |
Charges to expense for cash bonuses | 462 | 826 | $ 1,048 |
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 | $ 74 | $ (154) |  |
Discount Rate: |  |  |  |
Discount rate for pension plans | 2.60% | 3.20% | 4.40% |
Cash Contributions and Benefit Payments: |  |  |  |
Contributions to employee pension plans | $ 155 | $ 168 |  |
Estimated contributions to employee pension plans for the next fiscal year | 153 |  |  |
ESIP |  |  |  |
Employee Savings Investment Plan: |  |  |  |
Compensation expense | $ 281 | $ 284 | $ 270 |
U.S. |  |  |  |
Expected Return on Plan Assets: |  |  |  |
Estimated long-term rate of return on US pension plan assets | 6.50% | 6.75% | 6.75% |
Cash Contributions and Benefit Payments: |  |  |  |
Contributions to employee pension plans | $ 950 |  |  |
Estimated contributions to employee pension plans for the next fiscal year | 1,050 |  |  |
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 | 5,717 | $ 5,140 |  |
Accumulated benefit obligations pension plans | $ 13,608 | $ 12,781 |  |
Expected Return on Plan Assets: |  |  |  |
Estimated long-term rate of return on US pension plan assets | 6.50% | 6.80% | 6.80% |
Percentage of US pension plan assets relative to total pension plan assets | 65.00% |  |  |
Plan asset market valuation period, prior to year-end measurement date | 3 months |  |  |
Discount Rate: |  |  |  |
Discount rate for pension plans | 2.40% | 3.10% | 4.20% |
Cash Contributions and Benefit Payments: |  |  |  |
Contributions to employee pension plans | $ 950 | $ 1,096 |  |
U.S. | Pension Benefits | Equities | Minimum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 40.00% |  |  |
U.S. | Pension Benefits | Equities | Maximum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 65.00% |  |  |
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 | 40.00% |  |  |
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 | 5.00% |  |  |
U.S. | Pension Benefits | Cash | Minimum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 0.00% |  |  |
U.S. | Pension Benefits | Cash | Maximum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 25.00% |  |  |
U.S. | Other Benefits |  |  |  |
Discount Rate: |  |  |  |
Discount rate for pension plans | 2.40% | 3.10% | 4.30% |
Int’l. |  |  |  |
Cash Contributions and Benefit Payments: |  |  |  |
Contributions to employee pension plans | $ 263 |  |  |
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 | 1,487 | $ 1,371 |  |
Accumulated benefit obligations pension plans | $ 5,758 | $ 5,203 |  |
Expected Return on Plan Assets: |  |  |  |
Estimated long-term rate of return on US pension plan assets | 4.50% | 5.60% | 5.50% |
Discount Rate: |  |  |  |
Discount rate for pension plans | 2.40% | 3.20% | 4.40% |
Cash Contributions and Benefit Payments: |  |  |  |
Contributions to employee pension plans | $ 263 | $ 266 |  |
UNITED KINGDOM | Pension Benefits | Equities | Minimum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 10.00% |  |  |
UNITED KINGDOM | Pension Benefits | Equities | Maximum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 30.00% |  |  |
UNITED KINGDOM | Pension Benefits | Fixed Income and Cash | Minimum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 55.00% |  |  |
UNITED KINGDOM | Pension Benefits | Fixed Income and Cash | Maximum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 85.00% |  |  |
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% |  |  |
UNITED KINGDOM | Pension Benefits | Cash | Minimum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 0.00% |  |  |
UNITED KINGDOM | Pension Benefits | Cash | Maximum |  |  |  |
Primary Investment: |  |  |  |
Pension Plan - Board of Trustees approved asset allocation | 5.00% |  |  |

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