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Property, plant and equipment -Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | $ (276) | $ 374 | $ 152 | $ 2,827
Goodwill [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 0 | 0 | 1 | 1
Other intangible assets [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 1 | 0 | 1 | 0
Acquisition costs related to oil and gas prospects [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 113 | 111 | 117 | 170
Producing and development assets [Member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | (390) | 263 | 33 | 2,656
Property Plant And Equipment [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | (390) | 263 | 21 | 2,379
Property Plant And Equipment [member] | Goodwill [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 0 | 0 | 0 | 0
Property Plant And Equipment [member] | Other intangible assets [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 0 | 0 | 0 | 0
Property Plant And Equipment [member] | Acquisition costs related to oil and gas prospects [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 0 | 0 | 0 | 0
Property Plant And Equipment [member] | Producing and development assets [Member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | (390) | 263 | 21 | 2,379
Intangible assets [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 114 | 111 | 131 | 448
Intangible assets [member] | Goodwill [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 0 | 0 | 1 | 1
Intangible assets [member] | Other intangible assets [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 1 | 0 | 1 | 0
Intangible assets [member] | Acquisition costs related to oil and gas prospects [member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | 113 | 111 | 117 | 170
Intangible assets [member] | Producing and development assets [Member] |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |
Total net impairment losses (reversals) recognised | $ 0 | $ 0 | $ 12 | $ 277

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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 + Details
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