v3.26.3
Debt (Redemption and retirement) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2026
Mar. 31, 2026
Sep. 30, 2026
Sep. 30, 2025
Debt        
Repayments of debt     $ 718 $ 450
Loss on retirement of debt     $ (11)  
8.375% Senior Secured Notes due February 2028        
Debt        
Repayments of debt   $ 365    
Debt instrument interest rate stated percentage   8.375% 8.375%  
Aggregate principal amount of debt retired   $ 358    
Loss on retirement of debt     $ (11)  
8.00% Senior Secured Notes due September 2028        
Debt        
Debt instrument interest rate stated percentage     8.00%  
8.00% Senior Secured Notes due September 2028 | Subsequent Event        
Debt        
Repayments of debt $ 168      
Debt instrument interest rate stated percentage 8.00%      
Aggregate principal amount of debt retired $ 165