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REVENUES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
REVENUES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2025	Nov. 30, 2024
Disaggregation of Revenue [Line Items]
Total deferred revenues	$ 2,343	$ 1,840
Total revenues	5,387	4,970	$ 4,434
Revenues recognized from contract liability balances	551	85
Accounts receivable, net (Note 2)	$ 555	443
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Remaining performance obligation, expected timing of satisfaction, period	2 years 6 months
Volkswagen Group \| Principal Owner
Disaggregation of Revenue [Line Items]
Total deferred revenues	$ 1,794	1,526
Total revenues	836	73
Accounts receivable, net (Note 2)	328	$ 0
License \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total deferred revenues	1,295				$ 1,295
Financial Milestone Payments \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total deferred revenues				$ 250
Financial Milestone Payments \| Volkswagen Group \| Principal Owner
Disaggregation of Revenue [Line Items]
Total deferred revenues				$ 250
Start of Production Milestone Payments \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total deferred revenues	$ 210
Noncash Consideration \| Volkswagen Group
Disaggregation of Revenue [Line Items]
Total deferred revenues					$ 201
Chase Bank \| Revenue from Contract with Customer Benchmark \| Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	36.00%	37.00%