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Note 36 - Update as of April 29, 2020 (Tables)
 12 Months Ended
Dec. 31, 2019
Acquisition of IPSCO [member]  
Statement Line Items [Line Items]  
Disclosure of detailed information about business combination [text block]
Fair value of acquired assets and liabilities:   $ million
Property, Plant and Equipment    
506
  
Intangible assets    
170
  
Working capital    
144
  
Cash and Cash Equivalents    
4
  
Other assets    
46
  
Borrowings    
(53
 )
Provisions    
(27
 )
Other liabilities    
(77
 )
Deferred tax liabilities    
(3
 )
Net assets acquired    
710