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Commitments and Contingencies - Schedule of Changes in Estimated Loss (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	75 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2025
Loss contingency accrual roll forward
Balance at December 31, 2024		$ 1,001
Increase in accrued estimated losses		321
Amounts paid	$ (483)	(768)	$ (10,786)
Balance at September 30, 2025	554	554	554
2017/2018 Wildfire/Mudslide Events
Loss contingency accrual roll forward
Balance at December 31, 2024		426
Increase in accrued estimated losses		0
Amounts paid	(50)	(208)	(9,662)
Balance at September 30, 2025	218	218	218
Other Wildfire Events
Loss contingency accrual roll forward
Balance at December 31, 2024		575
Increase in accrued estimated losses		21
Amounts paid	(208)	(335)	(899)
Balance at September 30, 2025	261	261	261
Eaton Fire
Loss contingency accrual roll forward
Balance at December 31, 2024		0
Increase in accrued estimated losses		300
Amounts paid	(225)	(225)	(225)
Balance at September 30, 2025	$ 75	$ 75	$ 75

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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X

- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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- Definition

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+ References

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