Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	$ 88		$ 88		$ 54
Regulatory assets - noncurrent	593		593		473
Regulatory Liability, Current	25		25		234
Regulatory liabilities-noncurrent	1,409		1,409		1,389
Purchased power and fuel	220	$ 168	524	$ 370
Removal Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	1,154		1,154		1,136
Deferred Income Tax Charge [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	187		187		194
Asset Retirement Obligation Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	10		10		7
Revenue Subject to Refund [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities-noncurrent	0		0		0
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	21		21		39
Regulatory liabilities-noncurrent	55		55		52
Regulatory Clause Revenues, under-recovered
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		195
us-gaap_revenuerefund
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	4		4		0
Regulatory liabilities-noncurrent	3		3		0	$ 66	$ 14
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	23		23		0
Regulatory assets - noncurrent	136		136		1
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	95		95		95
Loss on Reacquired Debt [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	21		21		21
Environmental Restoration Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	134		134		133
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	20		20		26
Regulatory assets - noncurrent	76		76		68
Storm Costs
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	12		12		10
Regulatory assets - noncurrent	60		60		64
Fire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	5		5		4
Regulatory assets - noncurrent	25		25		27
pandemic
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	12		12		0
Regulatory assets - noncurrent	7		7		22
wildfire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	32		32		28
Deferred Fuel Costs
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	16		16		14
Regulatory assets - noncurrent	$ 7		$ 7		$ 14