SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DWR Loan (Details) - DWR Loan - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Government Assistance, Liability [Roll Forward]
Beginning balance	$ 808	$ 651	$ 886	$ 98
Proceeds received	$ 0	$ 380	$ 0	$ 980
Government Assistance, Liability, Increase, Statement of Financial Position [Extensible Enumeration]	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)
Ending balance	$ 791	$ 996	$ 791	$ 996
Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)	Long-term debt (includes $11.8 billion and $10.1 billion related to VIEs at respective dates)
Other Current Liabilities, Adjustments
Government Assistance, Liability [Roll Forward]
Total deduction	$ 2
Other Current Liabilities
Government Assistance, Liability [Roll Forward]
Total deduction		$ (14)	$ 0	$ (34)
Performance-Based Disbursements
Government Assistance, Liability [Roll Forward]
Total deduction	$ (2)	$ (21)	$ (20)	$ (60)
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	$ (17)	$ 0	$ (75)	$ 12
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration]	Operating and maintenance	Operating and maintenance	Operating and maintenance	Operating and maintenance

Government Assistance, Liability

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- Definition

Amount of liability from government assistance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

+ Details

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- Definition

Amount of decrease in liability from government assistance.

+ References

+ Details

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- Definition

Indicates line item in statement of financial position that includes decrease in liability from government assistance.

+ References

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- Definition

Amount of increase in liability from government assistance.

+ References

+ Details

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- Definition

Indicates line item in statement of financial position that includes increase in liability from government assistance.

+ References

+ Details

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- Definition

Indicates line item in statement of financial position that includes liability from government assistance.

+ References

+ Details

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