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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DWR Loan (Details) - DWR Loan - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Government Assistance, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 812 | $ 296 | $ 886 | $ 98
Proceeds received | $ 0 | $ 368 | $ 0 | $ 600
Government Assistance, Liability, Increase, Statement of Financial Position [Extensible Enumeration] | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates)
Ending balance | $ 808 | $ 651 | $ 808 | $ 651
Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.2 billion and $10.1 billion related to VIEs at respective dates)
Other Current Liabilities, Adjustments |  |  |  |
Government Assistance, Liability [Roll Forward] |  |  |  |
Total deduction | $ 6 |  |  |
Other Current Liabilities |  |  |  |
Government Assistance, Liability [Roll Forward] |  |  |  |
Total deduction |  | $ (8) | $ (3) | $ (20)
Performance-Based Disbursements |  |  |  |
Government Assistance, Liability [Roll Forward] |  |  |  |
Total deduction | $ (10) | $ (17) | $ (18) | $ (39)
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration] | Operating and maintenance | Operating and maintenance | Operating and maintenance | Operating and maintenance
Loan forgiveness and other adjustments |  |  |  |
Government Assistance, Liability [Roll Forward] |  |  |  |
Total deduction | $ 0 | $ 12 | $ (57) | $ 12
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration] | Operating and maintenance | Operating and maintenance | Operating and maintenance | Operating and maintenance

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