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DEBT - Green Convertible Notes (Details)	1 Months Ended
DEBT - Green Convertible Notes (Details)	Oct. 31, 2023 USD ($) $ / shares	Mar. 31, 2023 USD ($) $ / shares	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)
2029 Green Convertible Notes \| Convertible Debt
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 1,500,000,000
Stated interest rate (as percent)		4.625%
Conversion ratio		0.0496771
Conversion price (in dollars per share) \| $ / shares		$ 20.13
2029 Green Convertible Notes \| Convertible Debt \| Fair Value, Inputs, Level 2
Line of Credit Facility [Line Items]
Debt instrument, fair value			$ 1,608,000,000	$ 1,882,000,000
2030 Green Convertible Notes \| Convertible Debt
Line of Credit Facility [Line Items]
Aggregate principal amount	$ 1,725,000,000
Stated interest rate (as percent)	3.625%
Conversion ratio	0.042929
Conversion price (in dollars per share) \| $ / shares	$ 23.29
2030 Green Convertible Notes \| Convertible Debt \| Fair Value, Inputs, Level 2
Line of Credit Facility [Line Items]
Debt instrument, fair value			1,654,000,000	1,958,000,000
2031 Green Secured Notes \| Senior Notes
Line of Credit Facility [Line Items]
Aggregate principal amount					$ 1,250,000,000
Stated interest rate (as percent)					10.00%
2031 Green Secured Notes \| Senior Notes \| Fair Value, Inputs, Level 2
Line of Credit Facility [Line Items]
Debt instrument, fair value			$ 1,213,000,000	$ 1,231,000,000