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WILDFIRE-RELATED CONTINGENCIES (Insurance Receivable) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 26, 2022	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			$ 674.0	$ 2,238.0
Accrued insurance recoveries			681.0	649.0
Reimbursements			(108.0)	(2,213.0)
Insurance Receivable, Ending Balance		$ 1,247.0	1,247.0	674.0
2021 Dixie fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			0.0	0.0
Accrued insurance recoveries			563.0	0.0
Reimbursements			0.0	0.0
Insurance Receivable, Ending Balance		563.0	563.0	0.0
Insurance receivable		563.0	563.0
Accrued insurance recoveries, increase (decrease)		(6.5)
2020 Zogg fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			219.0	0.0
Accrued insurance recoveries			118.0	219.0
Reimbursements			(67.0)	0.0
Insurance Receivable, Ending Balance		270.0	270.0	219.0
Insurance receivable		337.0	337.0
Accrued insurance recoveries, increase (decrease)		6.5
2020 Zogg fire | Subsequent Event
Insurance Receivable [Roll Forward]
Reimbursements	$ (43.0)
2019 Kincade fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			430.0	0.0
Accrued insurance recoveries			0.0	430.0
Reimbursements			(16.0)	0.0
Insurance Receivable, Ending Balance		414.0	414.0	430.0
Insurance receivable		430.0	430.0
2018 Camp fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			0.0	1,380.0
Accrued insurance recoveries			0.0	0.0
Reimbursements			0.0	(1,380.0)
Insurance Receivable, Ending Balance		0.0	0.0	0.0
2017 Northern California wildfires
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			25.0	808.0
Accrued insurance recoveries			0.0	0.0
Reimbursements			(25.0)	(783.0)
Insurance Receivable, Ending Balance		0.0	0.0	25.0
2015 Butte fire
Insurance Receivable [Roll Forward]
Insurance Receivable, Beginning Balance			0.0	50.0
Accrued insurance recoveries			0.0	0.0
Reimbursements			0.0	(50.0)
Insurance Receivable, Ending Balance		$ 0.0	$ 0.0	$ 0.0

X

- Definition

Insurance Receivable [Roll Forward]

+ References

No definition available.

+ Details

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- Definition

Insurance Recoveries, Increase (Decrease)

+ References

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- Definition

Insurance Settlements Receivable, Reimbursements

+ References

No definition available.

+ Details

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- Definition

Liability Insurance Coverage, Insurance Receivable

+ References

No definition available.

+ Details

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

No definition available.

+ Details

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