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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	$ 185		$ 185		$ 221
Regulatory assets - noncurrent	619		619		492
Regulatory Liability, Current	55		55		48
Regulatory liabilities-noncurrent	1,413		1,413		1,398
Purchased power and fuel	380	$ 386	1,060	$ 910
Removal Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	1,193		1,193		1,173
Deferred Income Tax Charge [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	164		164		177
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	55		55		48
Regulatory liabilities-noncurrent	30		30		48
us-gaap_revenuerefund
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	26		26		0
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	94		94		143
Regulatory assets - noncurrent	73		73		63
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	104		104		104
Environmental Restoration Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	142		142		139
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	32		32		42
Regulatory assets - noncurrent	115		115		98
Storm Costs
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	13		13		12
Regulatory assets - noncurrent	48		48		55
Fire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	5		5		5
Regulatory assets - noncurrent	20		20		23
wildfire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	41		41		19
Regulatory assets - noncurrent	0		0		10
StormCosts - RCE
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	89		89		0
StormCosts - Jan 2024
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	$ 28		$ 28		$ 0

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No definition available.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Amount of operating expense for purchased power of regulated operation.

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