Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2025

Balance Sheet Components [Abstract]

Allowance for Credit Losses [Text Block]

The following summarizes activity during 2025 in the allowance for credit losses (in millions):

	Three Months Ended March 31,
Balance as of beginning of period	$	12
Increase in provision	3
Amounts written off	(4)
Recoveries	2
Balance as of end of period	$	13

Schedule of Other Current Assets [Table Text Block]

Other current assets consist of the following (in millions):

	March 31, 2025		December 31, 2024
Prepaid expenses	$	119	$	81
Assets from price risk management activities	26		32
Margin deposits	70		125
Other current assets	$	215	$	238

Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]

Electric utility plant, net consists of the following (in millions):     

	March 31, 2025		December 31, 2024
Electric utility plant in-service	$	15,028	$	14,863
Construction work-in-progress	693		567
Total cost	15,721		15,430
Less: accumulated depreciation and amortization	(5,187)		(5,085)
Electric utility plant, net	$	10,534	$	10,345

Schedule of Regulatory Assets and Liabilities [Text Block]

Regulatory assets and liabilities consist of the following (in millions):

	March 31, 2025					December 31, 2024
	Current			Noncurrent		Current			Noncurrent
Regulatory assets:
Price risk management	$	83		$	60	$	115		$	70
Pension and other postretirement plans	—			84		—			84
Trojan decommissioning activities	—			162		—			161
February 2021 ice storm and damage	13			43		14			44
January 2024 storm and damage	—			46		—			46
Reliability contingency events	—			95		—			90
2020 Labor Day wildfire	5			18		6			18
Wildfire mitigation	44			—		43			—
Other	19			125		27			119
Total regulatory assets	$	164		$	633	$	205		$	632
Regulatory liabilities:
Asset retirement removal costs	$	—		$	1,210	$	—		$	1,199
Deferred income taxes	—			174		—			179
Clearwater RAC	41			4		—			40
Other	40			24		53			22
Total regulatory liabilities	$	81	*	$	1,412	$	53	*	$	1,440

* Included in Accrued expenses and other current liabilities in the condensed consolidated balance sheets.

Other Liabilities Disclosure [Text Block]

Accrued expenses and other current liabilities consist of the following (in millions):

	March 31, 2025		December 31, 2024
Accrued employee compensation and benefits	$	56	$	80
Accrued taxes payable	32		36
Accrued interest payable	54		49
Accrued dividends payable	57		57
Regulatory liabilities—current	81		53
Margin deposits from wholesale counterparties	11		5
Other	146		130
Total accrued expenses and other current liabilities	$	437	$	410

Pension and Other Postretirement Benefits Disclosure [Text Block]

Components of net periodic benefit cost under the defined benefit pension plan are as follows (in millions):

	Three Months Ended March 31,
	2025		2024
Service cost	$	2	$	3
Interest cost*	8		8
Expected return on plan assets*	(9)		(10)
Net periodic benefit cost	$	1	$	1

* The net expense portion of non-service cost components are included in Miscellaneous income, net within Other income on the Company’s condensed consolidated statements of income and comprehensive income.