v3.25.4
Other Expenses (Income), Net - Schedule (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Sierre business interruption insurance recoveries $ 0 $ (15) $ 0 $ (15)
Currency losses, net 4 1 5 4
Unrealized (losses) gains on change in fair value of derivative instruments, net 33 (18) 70 (34)
Realized losses on change in fair value of derivative instruments, net 14 21 (13) 53
Loss on sale or disposal of assets, net 0 0 3 2
Interest income (4) (5) (14) (18)
Non-operating net periodic benefit cost (2) 0 (5) (1)
Other, net 7 7 22 24
Other expenses (income), net 381 (4) 426 121
September Oswego fire losses, net of recoveries        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Fixed asset charges 0 0 10 0
Inventory charges 0 0 1 0
Idle fixed costs 61 0 64 0
Repairs and clean-up costs 77 0 83 0
Excess costs to fulfill customer contracts 185 0 186 0
Property insurance recoveries (25) 0 (25) 0
Other 2 0 2 0
Sierre flood losses, net of recoveries 300 0 321 0
November Oswego fire losses, net of recoveries        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Fixed asset charges 26 0 26 0
Repairs and clean-up costs 26 0 26 0
Property insurance recoveries (25) 0 (25) 0
Sierre flood losses, net of recoveries 27 0 27 0
Sierre flood        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Fixed asset charges 0 0 0 30
Inventory charges 0 0 0 12
Idle fixed costs 0 4 0 20
Repairs and clean-up costs 2 14 9 31
Excess costs to fulfill customer contracts 0 4 4 27
Property insurance recoveries 0 (18) (3) (18)
Other 0 1 0 4
Sierre flood losses, net of recoveries $ 2 $ 5 $ 10 $ 106