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Note 12 - Intangible assets, net - Goodwill Allocated by CGU (Details) - Tubes [member]
$ in Millions
Dec. 31, 2024
USD ($)
Disclosure of information for cash-generating units [line items]  
Goodwill $ 1,090
Tamsa [Member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 365
Siderca [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 58
Hydrill Company [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 920
Hydrill Company [member] | Tamsa [Member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 346
Hydrill Company [member] | Siderca [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 265
Hydrill Company [member] | Hydril [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 309
Hydrill Company [member] | Other CGU [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill
Other acquisition [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 170
Other acquisition [member] | Tamsa [Member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 19
Other acquisition [member] | Siderca [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill 93
Other acquisition [member] | Hydril [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill
Other acquisition [member] | Other CGU [member]  
Disclosure of information for cash-generating units [line items]  
Goodwill $ 58