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Segment Information - Schedule of Assets by Segment (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 20,416 $ 20,451
Corporate, reconciling items, and eliminations (b)    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,314 1,965
Flat-Rolled | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 7,387 7,546
Mini Mill | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 8,499 7,569
USSE | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 2,132 2,229
Tubular | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 955 1,002
Total reportable segments | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 18,973 18,346
Other | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 129 140
Big River 2 | Operating Segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 3,900 $ 3,000