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Note 5 - Impairment charge - Additional impairment with the change in key assumptions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
OCTG (USA) [member] | Discount rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption $ (60)
OCTG (USA) [member] | Growth rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (43)
OCTG (USA) [member] | Projected change rate in future cash flows, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (16)
IPSCO [Member] | Discount rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (117)
IPSCO [Member] | Growth rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (77)
IPSCO [Member] | Projected change rate in future cash flows, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (41)
Coiled Tubing [member] | Discount rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (12)
Coiled Tubing [member] | Growth rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (6)
Coiled Tubing [member] | Projected change rate in future cash flows, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (5)
Rods USA [Member] | Discount rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (5)
Rods USA [Member] | Growth rate, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption (3)
Rods USA [Member] | Projected change rate in future cash flows, measurement input [member]  
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]  
Additional impairment due to reasonably possible increase (decrease) in key assumption $ (2)