Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	$ 177		$ 221
Regulatory assets - noncurrent	606		492
Regulatory Liability, Current	50		48
Regulatory liabilities-noncurrent	1,406		1,398
Purchased power and fuel	405	$ 304
Removal Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0
Regulatory liabilities-noncurrent	1,178		1,173
Deferred Income Tax Charge [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0
Regulatory liabilities-noncurrent	171		177
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	50		48
Regulatory liabilities-noncurrent	47		48
us-gaap_revenuerefund
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0
Regulatory liabilities-noncurrent	10		0
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	108		143
Regulatory assets - noncurrent	48		63
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0
Regulatory assets - noncurrent	104		104
Environmental Restoration Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0
Regulatory assets - noncurrent	141		139
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	33		42
Regulatory assets - noncurrent	102		98
Storm Costs
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	12		12
Regulatory assets - noncurrent	53		55
Fire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	5		5
Regulatory assets - noncurrent	22		23
wildfire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	19		19
Regulatory assets - noncurrent	13		10
StormCosts - RCE
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0
Regulatory assets - noncurrent	75		0
StormCosts - Jan 2024
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0
Regulatory assets - noncurrent	$ 48		$ 0