v3.25.4
Financial Instruments and Commodity Contracts - Summary of the Impact on AOCI and Earnings (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]        
Total cash flow hedging derivatives $ (296) $ (45) $ (338) $ (190)
Cash flow hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives (296) (61) (319) (199)
Cash flow hedges | Metal Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives (287) 32 (355) (96)
Cash flow hedges | Currency Exchange Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives (7) (101) 46 (102)
Cash flow hedges | Energy Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives (2) 1 (9) (2)
Cash flow hedges | Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives 0 7 (1) 1
Net investment hedges | Currency Exchange Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Total cash flow hedging derivatives $ 0 $ 16 $ (19) $ 9