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After tax compensation expense for stock options.

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Compensation expense for stock appreciation rights restricted stock performance units and restricted stock units.

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Maximum number of shares that may be issued under LTIP in form other than stock option stock appreciation right or award requiring full payment for shares by recipient.

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Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount of noncash expense for option under share-based payment arrangement.

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Stock Options and Other Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for stock options	$ 81	$ 105	$ 137
After tax compensation expense for stock options	64	83	89
Compensation expense for stock appreciation rights restricted stock performance units and restricted stock units	313	60	231
Compensation expense for stock appreciation rights, restricted stock, performance units and restricted stock units, after tax	266	47	150
Cash received in payment for option exercises	1,090	1,159	1,100
Tax benefits realized for the tax deductions from option exercises	43	43	48
Cash paid to settle performance units and stock appreciation rights	$ 119	157	187
Maximum number of share that may be issued under LTIP (in shares)	688,303
Total intrinsic value options exercised	$ 516	$ 506	$ 407
Total before-tax compensation cost related to nonvested share-based compensation arrangements	$ 55
Weighted-average period of recognition of unrecognized compensation cost related to nonvested share-based compensation arrangements	1 year 9 months 18 days
Chevron Long-Term Incentive Plan (LTIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of share that may be issued under LTIP (in shares)	72,000,000
For awards issued on or after May 29, 2013, the maximum number of shares that may be in a form other than a stock option, stock appreciation right or award requiring full payment for shares by the award recipient (in shares)	50,000,000
Chevron Long-Term Incentive Plan (LTIP) \| Maximum \| From April 2004 through May 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of share that may be issued under LTIP (in shares)	260,000,000
Performance Shares and Restricted Stock Units (RSUs) \| Chevron Long-Term Incentive Plan (LTIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	3 years
Performance Shares and Restricted Stock Units (RSUs) \| Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	3 years
Stock Options and Stock Appreciation Rights \| Chevron Long-Term Incentive Plan (LTIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	10 years
Stock Options and Stock Appreciation Rights \| Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	2,426,959			1,737,479
Shares granted (in shares)	1,054,556
Shares vested (in shares)		244,744
Shares forfeited (in shares)		120,332
Shares vested, fair value	$ 192
Restricted Stock Units (RSUs) \| Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term (in years)	5 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	4,386,784			3,669,730
Shares granted (in shares)	1,813,188
Shares vested (in shares)	684,620
Shares forfeited (in shares)	411,514
Shares vested, fair value	$ 370
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	4,000,000.0
Shares vested, fair value	$ 82