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Segment Information - Schedule of Assets by Segment (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 20,448 $ 20,451
Corporate, reconciling items, and eliminations (b)    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,462 1,965
Flat-Rolled | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 7,443 7,546
Mini Mill | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 8,059 7,569
USSE | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,351 2,229
Tubular | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,001 1,002
Total reportable segments | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 18,854 18,346
Other | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 132 140
Big River | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 3,400 $ 3,000