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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% |  |

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- Definition Year ultimate health care cost trend rate is expected to be reached, in CCYY format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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