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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DWR Loan (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Government Assistance, Liability [Roll Forward] |  |
Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration] | Long-term debt (includes $10.1 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.1 billion and $10.1 billion related to VIEs at respective dates)
DWR Loan |  |
Government Assistance, Liability [Roll Forward] |  |
Beginning balance | $ 886 | $ 98
Proceeds received | $ 0 | $ 232
Government Assistance, Liability, Increase, Statement of Financial Position [Extensible Enumeration] | Long-term debt (includes $10.1 billion and $10.1 billion related to VIEs at respective dates) | Long-term debt (includes $10.1 billion and $10.1 billion related to VIEs at respective dates)
Ending balance | $ 812 | $ 296
DWR Loan | Other Current Liabilities |  |
Government Assistance, Liability [Roll Forward] |  |
Total deduction | (9) | (12)
DWR Loan | Performance-Based Disbursements |  |
Government Assistance, Liability [Roll Forward] |  |
Total deduction | $ (8) | $ (22)
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration] | Operating and maintenance | Operating and maintenance
DWR Loan | Loan forgiveness and other adjustments |  |
Government Assistance, Liability [Roll Forward] |  |
Total deduction | $ (57) | $ 0
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration] | Operating and maintenance | Operating and maintenance

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