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Litigations - Contingencies assets (Details) R$ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2019 BRL (R$)	Nov. 30, 2019 USD ($)	Dec. 31, 2020 CAD ($) USD ($)	Dec. 31, 2020 BRL (R$) USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2010
Contingent assets
Contingent asset recognized				R$ 343	$ 66,000,000
VBG
Contingent assets
Ownership interest in subsidiary (as a percent)								51.00%
BSG Resource Limited
Contingent assets
Judicial decision amount, including interest					$ 2,000,000,000
Compulsory loan
Contingent assets
Amount requested for payment		$ 55,000,000
Damages sought | R$	R$ 301
ICMS included in PIS and COFINS tax base
Contingent assets
Number of judicial proceedings			2	2	2
Number of proceedings with definitive favorable decision			1	1	1
Contingent asset recognized				R$ 313	$ 60,000,000
Amount received				R$ 72	14,000,000
Canadian litigation matter
Contingent assets
Tax refund recognized						$ 221	$ 162,000,000
Contingent asset related to an income tax refund, included estimated interest			$ 21		15,000,000
Amount sought with costs and interest			$ 21		$ 15,000,000

X

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2020-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2020-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2020-01-01

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 19B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount of contingent assets recognized.

+ References

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- Definition

The amount of gain contingency, unrecorded amount.

+ References

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- Definition

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+ References

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- Definition

Cash received for the settlement of litigation during the current period.

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- Definition

The amount requested for payment of an award to the entity in a judicial decision.

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- Definition

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- Definition

The number of favorable judicial decision reached during the reported period.

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- Definition

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