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Employee Benefit Plans - Stock option activity (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of Stock Options Activity |  |  |
Weighted-Average Exercise Price at the beginning of year | $ 52.88 |  |
Weighted-Average Exercise Price, exercised | 36.28 |  |
Weighted-Average Exercise Price at the end of year | 54.11 | $ 52.88 |
Weighted-Average Exercise Price, Vested | 54.14 |  |
Weighted-Average Exercise Price, Exercisable | $ 54.33 |  |
Aggregate Intrinsic Value, outstanding at the beginning of the year | $ 214,000,000 |  |
Aggregate Intrinsic Value, exercised | 39,000,000 |  |
Aggregate Intrinsic Value, outstanding at the end of the year | 206,000,000 | $ 214,000,000 |
Aggregate Intrinsic Value, vested | 205,000,000 |  |
Aggregate Intrinsic Value, exercisable | $ 194,000,000 |  |
Stock option, Outstanding at the beginning of year | 19,379,677 |  |
Stock option, exercised | (1,339,480) |  |
Stock option, forfeited | 0 |  |
Stock option, expired or cancelled | 0 |  |
Stock options, Outstanding at the end of year | 18,040,197 | 19,379,677 |
Stock option, Vested | 17,922,026 |  |
Stock option, Exercisable at End of Year | 17,172,815 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate Intrinsic Value, exercised | $ 39,000,000 |  |
Employee Stock Option [Member] | 2014 Omnibus Stock And Performance Incentive Plan Of ConocoPhillips [Member] |  |  |
Summary of Stock Options Activity |  |  |
Weighted-Average Grant-Date Fair Value, granted |  |  | $ 9.18
Aggregate Intrinsic Value, exercised |  | $ 94,000,000 | $ 4,000,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average remaining contractual term of outstanding options | 4 years 5 months 4 days |  |
Weighted-average remaining contractual term of vested options | 4 years 4 months 28 days |  |
Weighted-average remaining contractual term exercisable | 4 years 3 months 14 days |  |
Weighted-Average Grant-Date Fair Value, granted |  |  | $ 9.18
Aggregate Intrinsic Value, exercised |  | $ 94,000,000 | $ 4,000,000
Cash received from exercise of stock options | $ 49,000,000 |  |
Tax benefit from exercise of options | 13,000,000 |  |
Unrecognized compensation cost from stock options | $ 0 |  |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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