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Related parties - Key management personnel remuneration (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Short-term benefits
Wages	$ 9	$ 8	$ 8
Direct and indirect benefits	16	11	11
Profit sharing program ("PLR")	8	1	10
Total short- term benefits	33	20	29
Long-term benefits
Shares based			3
Severance	7	4	20
Total short and long-term benefits	$ 40	$ 24	$ 52

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
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X

- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph e
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X

- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
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-URIDate 2020-01-01

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X

- Definition

The amount of direct and indirect benefits to key management personnel.

+ References

No definition available.

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- Definition

he amount of compensation to key management personnel in the form of profit sharing program.

+ References

No definition available.

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- Definition

The amount of compensation to key management personnel in the form of severance.

+ References

No definition available.

+ Details

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- Definition

The amount of compensation to key management personnel in the form of wages or pro-labor.

+ References

No definition available.

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- References

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No definition available.

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