Balance Sheet Components (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Unbilled Receivables, Current	$ 142			$ 142		$ 177
Accounts Receivable, Allowance for Credit Loss	14	$ 13		14		12
Finite-Lived Intangible Assets, Accumulated Amortization	649			649		611
Amortization of Intangible Assets	19		$ 18	38	$ 36
Line of Credit Facility, Current Borrowing Capacity	750			750
Line of Credit Facility, Maximum Borrowing Capacity	$ 850			$ 850
Debt Instrument, Covenant Description				65.00%
Ratio of Indebtedness to Net Capital	0.551			0.551
Line of Credit Facility, Remaining Borrowing Capacity	$ 750			$ 750
Authorized Short-Term Debt	900			900
Purchased power and fuel	294		275	662	680
Repayments of Long-term Debt				102	0
Amount above baseline net variable power costs				(19)
Revenues	807		758	1,735	1,687
Letters of Credit Outstanding, Amount	146			146
Line of Credit, Current	320			320
Revenues	807		$ 758	1,735	$ 1,687
Regulatory assets - noncurrent	581			581		632
Regulatory liabilities-noncurrent	1,420			1,420		1,440
Regulatory assets - current	188			188		205
RCE deferred		$ 92		3
Fire
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Regulatory assets - noncurrent	16			16		18
Regulatory assets - current	5			5		6
wildfire
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Regulatory assets - noncurrent	0			0		0
Regulatory assets - current	44			44		$ 43
Letter of Credit [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Commercial paper	$ 0			$ 0