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Note 11 - Intangible Assets, Net - Goodwill Allocated by CGU (Details) $ in Millions	Dec. 31, 2020 USD ($)
Disclosure of information for cash-generating units [line items]
Goodwill	$ 1,086
Tamsa (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	365
Siderca (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	358
Hydril [member]
Disclosure of information for cash-generating units [line items]
Goodwill	309
Other CGU [member]
Disclosure of information for cash-generating units [line items]
Goodwill	54
Tubes [member]
Disclosure of information for cash-generating units [line items]
Goodwill	166
Tubes [member] | Tamsa (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	19
Tubes [member] | Siderca (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	93
Tubes [member] | Hydril [member]
Disclosure of information for cash-generating units [line items]
Goodwill
Tubes [member] | Other CGU [member]
Disclosure of information for cash-generating units [line items]
Goodwill	54
Tubes [member] | Hydrill acquisition [member]
Disclosure of information for cash-generating units [line items]
Goodwill	920
Tubes [member] | Hydrill acquisition [member] | Tamsa (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	346
Tubes [member] | Hydrill acquisition [member] | Siderca (Hydril and other) [member]
Disclosure of information for cash-generating units [line items]
Goodwill	265
Tubes [member] | Hydrill acquisition [member] | Hydril [member]
Disclosure of information for cash-generating units [line items]
Goodwill	309
Tubes [member] | Hydrill acquisition [member] | Other CGU [member]
Disclosure of information for cash-generating units [line items]
Goodwill

X

- 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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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2019-01-01
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_c&doctype=Standard
-URIDate 2019-03-27

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