CONVERTIBLE PREFERRED STOCK - Schedule of convertible preferred stock (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Class of Stock [Line Items]
Shares authorized (in shares)	148,567,765	149,000,000
Shares issued (in shares)	141,989,676	142,000,000
Shares outstanding (in shares)	141,989,676	142,000,000
Gross amount	$ 435
Costs of raising capital	(4)
Net amount	431
Liquidation preference	450
Preferred stock redemptions	(1)
Preferred stock, value	$ 430	$ 430
Series A-1
Class of Stock [Line Items]
Shares authorized (in shares)	49,182,456
Shares issued (in shares)	47,215,752
Shares outstanding (in shares)	47,215,752
Price per share (in dollars per share)	$ 0.60
Gross amount	$ 28
Costs of raising capital	0
Net amount	28
Liquidation preference	$ 28
Series A-2
Class of Stock [Line Items]
Shares authorized (in shares)	41,953,016
Shares issued (in shares)	41,821,200
Shares outstanding (in shares)	41,821,200
Price per share (in dollars per share)	$ 0.15
Gross amount	$ 0
Costs of raising capital	0
Net amount	0
Liquidation preference	$ 6
Series B-1
Class of Stock [Line Items]
Shares authorized (in shares)	11,853,768
Shares issued (in shares)	11,289,304
Shares outstanding (in shares)	11,289,304
Price per share (in dollars per share)	$ 2.23
Gross amount	$ 25
Costs of raising capital	0
Net amount	25
Liquidation preference	$ 25
Series B-2
Class of Stock [Line Items]
Shares authorized (in shares)	5,768,000
Shares issued (in shares)	5,767,992
Shares outstanding (in shares)	5,767,992
Price per share (in dollars per share)	$ 1.74
Gross amount	$ 0
Costs of raising capital	0
Net amount	0
Liquidation preference	$ 10
Series C-1
Class of Stock [Line Items]
Shares authorized (in shares)	113,584
Shares issued (in shares)	56,784
Shares outstanding (in shares)	56,784
Price per share (in dollars per share)	$ 8.80
Gross amount	$ 0
Costs of raising capital	0
Net amount	0
Liquidation preference	$ 0
Series C-2
Class of Stock [Line Items]
Shares authorized (in shares)	8,728,176
Shares issued (in shares)	8,728,176
Shares outstanding (in shares)	8,728,176
Price per share (in dollars per share)	$ 6.87
Gross amount	$ 60
Costs of raising capital	(1)
Net amount	59
Liquidation preference	$ 60
Series C-3
Class of Stock [Line Items]
Shares authorized (in shares)	695,760
Shares issued (in shares)	695,760
Shares outstanding (in shares)	695,760
Price per share (in dollars per share)	$ 7.04
Gross amount	$ 5
Costs of raising capital	0
Net amount	5
Liquidation preference	$ 5
Series C-2
Class of Stock [Line Items]
Shares authorized (in shares)	728,024
Shares issued (in shares)	728,024
Shares outstanding (in shares)	728,024
Price per share (in dollars per share)	$ 6.87
Gross amount	$ 5
Costs of raising capital	0
Net amount	5
Liquidation preference	$ 5
Series D
Class of Stock [Line Items]
Shares authorized (in shares)	14,724,944
Shares issued (in shares)	14,724,944
Shares outstanding (in shares)	14,724,944
Price per share (in dollars per share)	$ 11.21
Gross amount	$ 166
Costs of raising capital	0
Net amount	166
Liquidation preference	$ 165
Series D
Class of Stock [Line Items]
Shares authorized (in shares)	5,451,176
Shares issued (in shares)	5,451,176
Shares outstanding (in shares)	5,451,176
Price per share (in dollars per share)	$ 11.21
Gross amount	$ 61
Costs of raising capital	0
Net amount	61
Liquidation preference	$ 61
Series E
Class of Stock [Line Items]
Shares authorized (in shares)	9,368,861
Shares issued (in shares)	5,510,564
Shares outstanding (in shares)	5,510,564
Price per share (in dollars per share)	$ 15.48
Gross amount	$ 85
Costs of raising capital	(3)
Net amount	82
Liquidation preference	$ 85