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Financial instruments - Fair value heirarchy (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of fair value measurement [line items] |  |
Non-current derivative financial instruments - assets | $ 2,476 | $ 1,365
Current financial investments | 11,865 | 7,426
Current derivative financial instruments - assets | 886 | 578
Non-current derivative financial instruments - liabilities | (676) | (1,173)
Current derivative financial instruments liabilities | (1,710) | (462)
Fair value [member] |  |
Disclosure of fair value measurement [line items] |  |
Non-current financial investments | 3,822 | 3,433
Non-current derivative financial instruments - assets | 2,476 | 1,365
Current financial investments | 216 | 377
Current derivative financial instruments - assets | 886 | 578
Cash equivalents | 492 | 700
Non-current derivative financial instruments - liabilities | (676) | (1,173)
Current derivative financial instruments liabilities | (1,710) | (462)
Net fair value | 5,505 | 4,817
Level 1 [member] |  |
Disclosure of fair value measurement [line items] |  |
Non-current financial investments | 1,379 | 1,456
Non-current derivative financial instruments - assets | 0 | 7
Current financial investments | 66 | 0
Current derivative financial instruments - assets | 419 | 86
Non-current derivative financial instruments - liabilities | 0 | (6)
Current derivative financial instruments liabilities | (432) | (70)
Net fair value | 1,432 | 1,473
Level 2 [member] |  |
Disclosure of fair value measurement [line items] |  |
Non-current financial investments | 2,135 | 1,700
Non-current derivative financial instruments - assets | 2,146 | 1,139
Current financial investments | 150 | 377
Current derivative financial instruments - assets | 443 | 461
Cash equivalents | 492 | 700
Non-current derivative financial instruments - liabilities | (671) | (1,148)
Current derivative financial instruments liabilities | (1,277) | (394)
Net fair value | 3,417 | 2,835
Level 3 [member] |  |
Disclosure of fair value measurement [line items] |  |
Non-current financial investments | 308 | 277
Non-current derivative financial instruments - assets | 330 | 219
Current derivative financial instruments - assets | 24 | 33
Non-current derivative financial instruments - liabilities | (5) | (19)
Net fair value | $ 657 | $ 510

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- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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