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Significant accounting policies (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Apr. 08, 2019	Jan. 01, 2019
Non-current assets [abstract]
Property, plant and equipment	$ 12,263	$ 12,069
Right-of-use assets	1,676	1,677		$ 1,554
Equity [abstract]
Reserves	55,738	54,618
Current liabilities [abstract]
Current lease liabilities	$ 286	$ 246
Increase (decrease) due to changes in accounting policy, IFRS 16 [member]
Non-current assets [abstract]
Property, plant and equipment				(101)
Equity [abstract]
Reserves				3
Current liabilities [abstract]
Current lease liabilities				268
Discontinued operations [member]
Non-current assets [abstract]
Property, plant and equipment			$ 2,858
Right-of-use assets			$ 269	276
Discontinued operations [member] | Previously stated [member]
Non-current assets [abstract]
Right-of-use assets				$ 75

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
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-URIDate 2019-03-27

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- References

No definition available.

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- References

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- Definition

A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph e
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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 73
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2019-03-27

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- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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