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Stock Options and Other Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense for stock options |  | $ 94 | $ 81 | $ 105 |
After tax compensation expense for stock options |  | 74 | 64 | 83 |
Compensation expense for stock appreciation rights restricted stock performance units and restricted stock units |  | 96 | 313 | 60 |
Compensation expense for stock appreciation rights, restricted stock, performance units and restricted stock units, after tax |  | 76 | 266 | 47 |
Cash received in payment for option exercises |  | 226 | 1,090 | 1,159 |
Tax benefits realized for the tax deductions from option exercises |  | 8 | 43 | 43 |
Cash paid to settle performance units and stock appreciation rights |  | $ 95 | 119 | 157 |
Maximum number of share that may be issued under LTIP (in shares) |  | 644,376 |  |  |
Total intrinsic value options exercised |  | $ 92 | $ 516 | $ 506 |
Total before-tax compensation cost related to nonvested share-based compensation arrangements |  | $ 57 |  |  |
Weighted-average period of recognition of unrecognized compensation cost related to nonvested share-based compensation arrangements |  | 1 year 8 months 12 days |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding (in shares) |  | 3,303,933 |  |  | 2,512,345
Shares granted (in shares) |  | 1,253,337 |  |  |
Shares vested (in shares) |  |  | 165,007 |  |
Shares forfeited (in shares) |  |  | 296,742 |  |
Shares vested, fair value |  | $ 197 |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding (in shares) |  | 4,434,797 |  |  | 4,386,784
Shares granted (in shares) |  | 2,064,598 |  |  |
Shares vested (in shares) |  | 676,282 |  |  |
Shares forfeited (in shares) |  | 1,340,303 |  |  |
Shares vested, fair value |  | $ 385 |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding (in shares) |  | 4,100,000 |  |  |
Shares vested, fair value |  | $ 34 |  |  |
Noble, Change-in-Control Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash paid to settle performance units and stock appreciation rights |  | $ 11 |  |  |
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) |  | 67,000,000 |  |  |
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 |  |  |
Chevron Long-Term Incentive Plan (LTIP) | Performance Shares and Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term (in years) |  | 3 years |  |  |
Chevron Long-Term Incentive Plan (LTIP) | Stock Options and Stock Appreciation Rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term (in years) |  | 10 years |  |  |
Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance | Performance Shares and Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term (in years) |  | 3 years |  |  |
Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance | Stock Options and Stock Appreciation Rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term (in years) |  | 10 years |  |  |
Chevron Long-Term Incentive Plan (LTIP), 2017 Issuance | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award contractual term (in years) |  | 5 years |  |  |
Noble Share-Based Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exchange ratio due to acquisition | 11.91% |  |  |  |
Exercisable period | 5 years |  |  |  |

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