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Taxes - Contingency (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2021
Contingencies
Deferred income taxes		$ 23		$ 17
Foreign Tax Authority [Member] | BRAZIL
Contingencies
Deferred income taxes				17
Foreign Tax Authority [Member] | BRAZIL | Other Assets and Prepaid Expenses
Contingencies
Future tax credits				$ 51
Tax years 2005 - 2018 | Indirect tax credits | Foreign Tax Authority [Member] | BRAZIL | Maximum [Member]
Contingencies
Amount of indirect tax credits expected to receive			$ 66
Tax years 2005 - 2014 | Foreign Tax Authority [Member] | BRAZIL | Other operating income, net
Contingencies
Additional credits		$ 35
Tax years 2005 - 2014 | Indirect tax credits | Foreign Tax Authority [Member] | BRAZIL | Minimum [Member]
Contingencies
Amount of indirect tax credits expected to receive			$ 22
Tax years 2015 - 2018 | Foreign Tax Authority [Member] | BRAZIL | Other operating income, net
Contingencies
Additional credits	$ 15

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- Definition

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123427490&loc=d3e31917-109318

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