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Property, plant and equipment -Impairments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | $ 4,093 | $ (315)
The total net impairment losses recognised under IAS 36 | 4,043 |
Acquisition costs related to oil and gas prospects [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 49 | 52
Goodwill [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 164 |
Other intangible assets [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 41 |
Producing and development assets [Member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 3,838 | (367)
Property Plant And Equipment [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 3,230 | (604)
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 loss/ (reversal) recognized | 0 | 0
Property Plant And Equipment [member] | Goodwill [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 0 |
Property Plant And Equipment [member] | Other intangible assets [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 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 loss/ (reversal) recognized | 3,230 | (604)
Intangible assets [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 863 | 289
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 loss/ (reversal) recognized | 49 | 52
Intangible assets [member] | Goodwill [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 164 |
Intangible assets [member] | Other intangible assets [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | 41 |
Intangible assets [member] | Producing and development assets [Member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Total net impairment loss/ (reversal) recognized | $ 608 | $ 237

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_99&doctype=Standard -URIDate 2019-03-27 + Details
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