v3.26.1
Debt (Redemption and retirement) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Debt      
Repayments of debt   $ 586 $ 240
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)