v3.25.1
Fair Value Measurements (Derivative Assets and Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Netting Adjustment $ (59) $ (32)
Derivative Asset 122 14
Liabilities, Netting Adjustment 59 32
Derivative Liability (54) (117)
Level 2 Instruments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 181 46
Financial Liabilities Fair Value Disclosure (113) (149)
Level 2 Instruments [Member] | Metal contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 152 33
Financial Liabilities Fair Value Disclosure (62) (112)
Level 2 Instruments [Member] | Currency exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 23 11
Financial Liabilities Fair Value Disclosure (45) (30)
Level 2 Instruments [Member] | Energy contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 6 2
Financial Liabilities Fair Value Disclosure (1) (5)
Level 2 Instruments [Member] | Interest rate swap contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0 0
Financial Liabilities Fair Value Disclosure $ (5) $ (2)