DEBT - Volkswagen Group Loan Commitment and Department of Energy Loan (Details) - USD ($)	Mar. 31, 2025	Jan. 31, 2025	Dec. 31, 2024	Nov. 30, 2024
Line of Credit Facility [Line Items]
Total contract liabilities	$ 1,899,000,000		$ 1,840,000,000
Volkswagen Group | Noncash Consideration
Line of Credit Facility [Line Items]
Total contract liabilities	$ 201,000,000
Loan Agreements | Term Loan
Line of Credit Facility [Line Items]
Unused borrowing capacity, amount not yet available				$ 1,000,000,000
Note A Loan | Term Loan | Tranche One
Line of Credit Facility [Line Items]
Unused borrowing capacity, amount not yet available		$ 3,355,000,000
Note A, B and DOE Loan | Term Loan | Tranche Two
Line of Credit Facility [Line Items]
Unused borrowing capacity, amount not yet available		$ 2,620,000,000