Financial Instruments and Commodity Contracts - Summary of the Impact on AOCI and Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	$ (151)	$ 233
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	(154)	233
Cash flow hedges | Metal Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	(120)	226
Cash flow hedges | Currency Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	(36)	8
Cash flow hedges | Energy Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	0	(1)
Cash flow hedges | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	2	0
Net investment hedges | Currency Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total cash flow hedging derivatives	$ 3	$ 0