Related Parties - Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Percentage of shareholders to gain majority for change in control	35.00%
Associates
Disclosure of transactions between related parties [line items]
Sales and services rendered to related parties	$ 19	$ 0	$ 0
Purchases and services acquired from related parties	12	19	16
Outstanding balances arising from sale of goods and services due by related parties	19	19	7
Joint ventures
Disclosure of transactions between related parties [line items]
Sales and services rendered to related parties	7	10	12
Purchases and services acquired from related parties	1	0	3
Outstanding balances arising from sale of goods and services due by related parties	$ 1	$ 0	$ 2
CEO
Disclosure of transactions between related parties [line items]
Notice Period	12 months
Change of control	12 months
CFO
Disclosure of transactions between related parties [line items]
Notice Period	6 months
Change of control	6 months
EXCO
Disclosure of transactions between related parties [line items]
Notice Period	6 months
Change of control	6 months

Executive Contract, Change In Control

No definition available.

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- Definition

Executive Contract, Notice Period

+ References

No definition available.

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- Definition

Executive Contract, Percentage Of Shareholders To Gain Majority For Change In Control

+ References

No definition available.

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- Definition

Purchases of Property and Other Assets and Services Received, Related Party Transactions

+ References

No definition available.

+ Details

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- Definition

Revenue From Sale of Goods and Rendering of Services, Related Party Transactions

+ References

No definition available.

+ Details

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- Definition

The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 20
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_20&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 18
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_18_b&doctype=Standard
-URIDate 2018-03-16

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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