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Consolidated Statement of Equity (Deficit) (Unaudited) - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Redeemable Convertible Preferred Stock [Member]
Balance at Dec. 31, 2024 $ 641   $ 1,150 $ (393) $ (104) $ (12) $ 218
Net loss (7)     (7)      
Currency translation adjustments 6       6    
Pension and other postretirement liability adjustments (75)       (75)    
Preferred stock cash dividends (1)   (1)        
Preferred stock in-kind dividends (2)   (2)       2
Preferred stock deemed dividends (1)   0       0
Treasury stock purchases           (1)  
Stock-based compensation 2   2        
Balance at Mar. 31, 2025 563   1,149 (400) (173) (13) 220
Balance at Dec. 31, 2025 614 $ 1 1,278 (521) (118) (26) 99
Net loss (16)     (16)      
Currency translation adjustments 1       1    
Extinguishment of 4.0% Series B preferred stock 100   100       (100)
Issuance of 6.0% Series B preferred stock (102)   (102)       72
Preferred stock cash dividends (1)   (1)        
Preferred stock deemed dividends (1)   (1)       1
Treasury stock purchases     1     (1)  
Stock-based compensation 5   5        
Balance at Mar. 31, 2026 $ 600 $ 1 $ 1,280 $ (537) $ (117) $ (27) $ 72