v3.26.1
Financial Instruments and Commodity Contracts (Gain (Loss) Recognition) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other expenses (income), net Other expenses (income), net Other expenses (income), net
Losses recognized on balance sheet remeasurement currency exchange contracts, net $ 9 $ 30 $ 7
Realized losses (gains), net 35 97 (80)
Unrealized losses (gains) on other derivative instruments, net 77 (57) 36
Total loss (gain) recognized in other expenses (income), net 121 70 (37)
Derivatives not designated as hedging instruments:      
Derivative Instruments, Gain (Loss) [Line Items]      
Total loss (gain) recognized in other expenses (income), net 123 73 (36)
Derivatives not designated as hedging instruments: | Metal contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Total loss (gain) recognized in other expenses (income), net 118 40 (42)
Derivatives not designated as hedging instruments: | Currency exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Total loss (gain) recognized in other expenses (income), net 17 30 8
Derivatives not designated as hedging instruments: | Energy contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Total loss (gain) recognized in other expenses (income), net (12) 3 (2)
Derivatives designated as hedging instruments:      
Derivative Instruments, Gain (Loss) [Line Items]      
Total loss (gain) recognized in other expenses (income), net $ (2) $ (3) $ (1)