SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - DWR Loan (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Government Assistance, Liability [Roll Forward]
Government Assistance, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)
DWR Loan
Government Assistance, Liability [Roll Forward]
Beginning balance	$ 98	$ 312	$ 0
Proceeds received	$ 980	$ 0	$ 350
Government Assistance, Liability, Increase, Statement of Financial Position [Extensible Enumeration]	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)	Long-term debt (includes $10.1 billion and $10.5 billion related to VIEs at respective dates)
Ending balance	$ 886	$ 98	$ 312
DWR Loan \| Performance-Based Disbursements
Government Assistance, Liability [Roll Forward]
Total deduction	$ (117)	$ (124)	$ (38)
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration]	Operating and maintenance	Operating and maintenance	Operating and maintenance
DWR Loan \| Loan forgiveness and other adjustments
Government Assistance, Liability [Roll Forward]
Total deduction	$ (75)	$ (90)	$ 0
Government Assistance, Liability, Decrease, Statement of Financial Position [Extensible Enumeration]	Operating and maintenance	Operating and maintenance	Operating and maintenance

Government Assistance, Liability

No definition available.

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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

+ Details

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- Definition

Amount of increase in liability from government assistance.

+ References

+ Details

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Period Type:	duration

- 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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- Details

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- Details

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- Details

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