v3.25.4
Financial Instruments and Commodity Contracts - Gain (Loss) Reclassification (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Income tax provision $ (4) $ (39) $ (115) $ (150)
Net (loss) income from continuing operations (159) 110 100 389
Cash flow hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision (118) (86) (41) (179)
Income tax provision 30 23 9 47
Net (loss) income from continuing operations (88) (63) (32) (132)
Cash flow hedges | Energy Contracts | Cost of Goods Sold        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision (1) (2) (3) (8)
Cash flow hedges | Metal Contracts | Net Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision (121) (75) (42) (154)
Cash flow hedges | Currency Exchange Contracts | Cost of Goods Sold        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision 4 (4) 4 (6)
Cash flow hedges | Currency Exchange Contracts | Net Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision 1 $ (5) 3 (11)
Cash flow hedges | Currency Exchange Contracts | Depreciation and Amortization        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision     (2) (2)
Cash flow hedges | Interest Rate Swap | Interest Expense and Amortization of Debt Issuance Costs        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) income before income tax provision $ (1)   $ (1) $ 2