v3.25.1
Financial Instruments and Commodity Contracts (Gain (Loss) Reclassification) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of goods sold (exclusive of depreciation and amortization) Cost of goods sold (exclusive of depreciation and amortization) Cost of goods sold (exclusive of depreciation and amortization)
Income from continuing operations before income tax provision $ 842 $ 818 $ 806
Income tax provision (benefit) (159) (218) (147)
Net income 683 600 657
Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Income from continuing operations before income tax provision (225) 178 321
Income tax provision (benefit) 58 (47) (76)
Net income (167) 131 245
Cash flow hedges | Energy contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) (8) (5) 32
Cash flow hedges | Interest rate swap contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) 2 2 0
Cost of goods sold | Cash flow hedges | Metal contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) (1) 5 0
Cost of goods sold | Cash flow hedges | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) (9) 17 18
Net sales | Cash flow hedges | Metal contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) (185) 181 332
Net sales | Cash flow hedges | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) (21) (19) (57)
Selling, General and Administrative Expenses | Cash flow hedges | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) 0 0 1
Depreciation and amortization | Cash flow hedges | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCI into income (expense) $ (3) $ (3) $ (5)