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Leases - Non-current debt maturity profile (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Lease liabilities [abstract]
Total repayment of non-current lease liability	[1]	$ 3,220	$ 3,191
Year 2 and 3 [member]
Lease liabilities [abstract]
Total repayment of non-current lease liability		1,513	1,310
Year 4 and 5 [member]
Lease liabilities [abstract]
Total repayment of non-current lease liability		748	676
After 5 years [member]
Lease liabilities [abstract]
Total repayment of non-current lease liability		$ 959	$ 1,204
[1] * Lease liabilities are separated from the line item Finance debt and 2019 is reclassified.

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- Definition

The amount of non-current lease liabilities. [Refer: Lease liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

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