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Income Taxes - Income Taxes Paid/(Refunded) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Taxes      
United States Federal $ (7)    
Italy 1    
Income Taxes Paid, Net, Total (6) $ (66) $ (105)
Kansas      
Income Taxes      
State: (3)    
Tennessee      
Income Taxes      
State: 2    
Other      
Income Taxes      
State: $ 1