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Intangible Assets - Goodwill (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2023 $ 920
Additions 0
Balance at March 31, 2024 920
Flat-Rolled  
Goodwill [Line Items]  
Balance at December 31, 2023 0
Additions 0
Balance at March 31, 2024 0
Mini Mill  
Goodwill [Line Items]  
Balance at December 31, 2023 916
Additions 0
Balance at March 31, 2024 916
USSE  
Goodwill [Line Items]  
Balance at December 31, 2023 4
Additions 0
Balance at March 31, 2024 4
Tubular  
Goodwill [Line Items]  
Balance at December 31, 2023 0
Additions 0
Balance at March 31, 2024 $ 0