DEBT - Volkswagen Group Loan Commitment and Department of Energy Loan (Details)	Apr. 30, 2026 USD ($) tranch	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jan. 31, 2025 tranch	Nov. 30, 2024 USD ($)
Line of Credit Facility [Line Items]
Total deferred revenues		$ 2,054,000,000	$ 2,343,000,000
Volkswagen Group \| Noncash Consideration
Line of Credit Facility [Line Items]
Total deferred revenues					$ 201,000,000
Term Loan
Line of Credit Facility [Line Items]
Debt instrument, number of tranches \| tranch				2
Term Loan \| Subsequent Event
Line of Credit Facility [Line Items]
Debt instrument, number of tranches \| tranch	2
Loan Agreements \| Term Loan
Line of Credit Facility [Line Items]
Aggregate principal amount					$ 1,000,000,000
Department of Energy Loan, Tranche One \| Term Loan \| Subsequent Event
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 3,355,000,000
Term loan (in years)	15 years
Interest costs capitalized	$ 315,000,000
Department of Energy Loan, Trance Two \| Term Loan \| Subsequent Event
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 651,000,000
Term loan (in years)	10 years
Interest costs capitalized	$ 179,000,000