v3.26.1
Commitments and Contingencies - Other Commitments and Contingencies (Details)
$ in Millions
 3 Months Ended 12 Months Ended 38 Months Ended
Mar. 31, 2026
USD ($)
location
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
location
Mar. 31, 2026
USD ($)
location
Loss Contingencies [Line Items]        
Environmental loss contingency, statement of financial position, extensible enumeration, not disclosed flag Consolidated Balance Sheets   Consolidated Balance Sheets  
Number of locations with one or more subsidiaries in conjunction with other parties identified as potentially responsible parties | location 8     8
Employees covered by collective bargaining agreements 80.00%      
Other Environmental Claims        
Loss Contingencies [Line Items]        
Environmental matters liabilities $ 62   $ 63 $ 62
Current environmental liability $ 15   $ 15 $ 15
Known cleanup and remediation locations and projects | location 69   69 69
Number of sites - representative sample | location 18     18
Liability associated with those sites $ 54     $ 54
Environmental locations representative sample liability payout period, in years 5 years      
Eastern Ohio Incident        
Loss Contingencies [Line Items]        
Insurance recoveries $ 1 $ 224   $ 1,100