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Employee Benefit Plans - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	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	$ 6,357	$ 4,448
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	6.80%	7.20%
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	92.00%
Benefit Plan Trusts:
Number of Chevron treasury stocks held in benefit plan trust for funding obligations	14,168	14,168	14,168	14,168
Various grantor trust assets invested primarily in interest earning accounts	$ 35	$ 34
Employee Incentive Plan
Charges to expense for cash bonuses	826	1,048	$ 936
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	$ (154)	$ (312)
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	14 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	3.20%	4.40%	3.80%
Cash Contributions and Benefit Payments:
Contributions to employee pension plans	$ 168	$ 166
Estimated contributions to employee pension plans for the next fiscal year	174
ESIP
Employee Savings Investment Plan:
Compensation expense	$ 284	$ 270	$ 316
U.S.
Expected Return on Plan Assets:
Estimated long-term rate of return on US pension plan assets	6.75%	6.75%	6.75%
Cash Contributions and Benefit Payments:
Contributions to employee pension plans	$ 1,096
Estimated contributions to employee pension plans for the next fiscal year	1,250
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	5,140	$ 3,701
Accumulated benefit obligations pension plans	$ 12,781	$ 10,514
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	$ 385
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	$ 320
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	3 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	68.00%
Plan asset market valuation period, prior to year-end measurement date	3 months
Discount Rate:
Discount rate for pension plans	3.10%	4.20%	3.50%
Cash Contributions and Benefit Payments:
Contributions to employee pension plans	$ 1,096	$ 803
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	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	15.00%
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	3.10%	4.30%	3.60%
Int’l.
Expected Return on Plan Assets:
Estimated long-term rate of return on US pension plan assets	5.60%	5.50%	5.50%
Cash Contributions and Benefit Payments:
Contributions to employee pension plans	$ 266
Estimated contributions to employee pension plans for the next fiscal year	250
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	1,371	$ 1,059
Accumulated benefit obligations pension plans	$ 5,203	$ 4,360
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	$ 46
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	6 years
Amortization of prior service (credits) costs during the next year	$ 10
Discount Rate:
Discount rate for pension plans	3.20%	4.40%	3.90%
Cash Contributions and Benefit Payments:
Contributions to employee pension plans	$ 266	$ 232
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%