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Intangible Assets - Goodwill (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2020 $ 4
Additions 905
Balance at September 30, 2021 909
Flat-Rolled  
Goodwill [Line Items]  
Balance at December 31, 2020 0
Additions 0
Balance at September 30, 2021 0
Mini Mill  
Goodwill [Line Items]  
Balance at December 31, 2020 0
Additions 905
Balance at September 30, 2021 905
USSE  
Goodwill [Line Items]  
Balance at December 31, 2020 4
Additions 0
Balance at September 30, 2021 4
Tubular  
Goodwill [Line Items]  
Balance at December 31, 2020 0
Additions 0
Balance at September 30, 2021 $ 0