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Provisions, commitments, contingent liabilities and contingent assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of other provisions [line items] |  |  |  |  |  |
Income from price review related changes, before tax | $ (7) | $ 6 | $ (160) | $ (2) | $ (168) | $ (1,283)
Marketing, Midstream and Processing (MMP) [Member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Onerous contracts provision | 154 |  |  | $ 154 |  |
Price review arbitration [Member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Reduction in exposure due to settlement | (1,300) |  |  |  |  |
Income from price review related changes, before tax | 150 |  |  |  |  |
Adjustments to revenue from contracts with customers net of tax | 30 |  |  |  |  |
Dispute with Brazilian tax authorities |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Proportion of ownership interest divested |  |  |  | 40.00% |  |
KKD Oil Sands Partnership [Member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Estimated exposure | 360 |  |  | $ 360 |  |
Proportion of ownership interest divested |  |  |  | 40.00% |  |
Government dispute [Member] |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |
Effect Of Dispute Resolution Recongised In Profit And Loss | $ 0 |  |  |  |  |

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- Definition The amount of expense arising from a dispute resolution. + References No definition available. + Details
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- Definition The increase (decrease) in other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in contract assets resulting from cumulative catch-up adjustments to revenue arising from a change in an estimate of the transaction price. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Increase (decrease) through cumulative catch-up adjustments to revenue, contract assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_118_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of provision for onerous contracts. An onerous contract is a contract in which the unavoidable costs of meeting the obligation under the contract exceed the economic benefits expected to be received under it. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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