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Financial and capital risk management - Option related to SPE (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) item EquityInstruments | Dec. 31, 2019 USD ($) EquityInstruments | Dec. 31, 2018 USD ($)
Derivative financial instruments. |  |  |
Financial settlement inflows (outflows) | $ (34) | $ (324) | $ (67)
Call Option -SPE - Brought [Member] |  |  |
Derivative financial instruments. |  |  |
Notional | EquityInstruments | 137,751,623 | 137,751,623 |
Average strike per share | item | 2.92 |  |
Value at risk | $ 2 |  |

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_41&doctype=Standard -URIDate 2020-01-01 + Details
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