Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	$ 165		$ 165		$ 221
Regulatory assets - noncurrent	617		617		492
Regulatory Liability, Current	55		55		48
Regulatory liabilities-noncurrent	1,406		1,406		1,398
Purchased power and fuel	275	$ 220	680	$ 524
Removal Costs [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	1,188		1,188		1,173
Deferred Income Tax Charge [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	167		167		177
Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	55		55		48
Regulatory liabilities-noncurrent	38		38		48
us-gaap_revenuerefund
Regulatory Assets and Liabilities [Line Items]
Regulatory Liability, Current	0		0		0
Regulatory liabilities-noncurrent	13		13		0
Deferred Derivative Gain (Loss) [Member]
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	105		105		143
Regulatory assets - noncurrent	48		48		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	23		23		42
Regulatory assets - noncurrent	110		110		98
Storm Costs
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	13		13		12
Regulatory assets - noncurrent	50		50		55
Fire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	5		5		5
Regulatory assets - noncurrent	21		21		23
wildfire
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	19		19		19
Regulatory assets - noncurrent	21		21		10
StormCosts - RCE
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	77		77		0
StormCosts - Jan 2024
Regulatory Assets and Liabilities [Line Items]
Regulatory Assets, Current	0		0		0
Regulatory assets - noncurrent	$ 44		$ 44		$ 0