Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2023

Balance Sheet Components [Abstract]

Allowance for Credit Losses [Text Block]

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

	Three Months Ended June 30,		Six Months Ended June 30,
	2023		2023
Balance as of beginning of period	$	13	$	12
Increase in provision	1		4
Amounts written off	(3)		(6)
Recoveries	2		3
Balance as of end of period	$	13	$	13

Schedule of Other Current Assets [Table Text Block]

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

	June 30, 2023		December 31, 2022
Prepaid expenses	$	56	$	69
Assets from price risk management activities	75		313
Margin deposits	26		116
Other current assets	$	157	$	498

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

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

	June 30, 2023		December 31, 2022
Electric utility plant in-service	$	12,868	$	12,421
Construction work-in-progress	568		467
Total cost	13,436		12,888
Less: accumulated depreciation and amortization	(4,595)		(4,423)
Electric utility plant, net	$	8,841	$	8,465

Schedule of Regulatory Assets and Liabilities [Text Block]

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

	June 30, 2023					December 31, 2022
	Current			Noncurrent		Current			Noncurrent
Regulatory assets:
Price risk management	$	23		$	136	$	—		$	1
Pension and other postretirement plans	—			95		—			95
Debt issuance costs	—			21		—			21
Trojan decommissioning activities	—			134		—			133
February 2021 ice storm and damage	12			60		10			64
Power cost adjustment mechanism	16			7		14			14
2020 Labor Day wildfire	5			25		4			27
COVID-19	12			7		—			22
Wildfire mitigation	—			32		—			28
Other	20			76		26			68
Total regulatory assets	$	88		$	593	$	54		$	473
Regulatory liabilities:
Asset retirement removal costs	$	—		$	1,154	$	—		$	1,136
Deferred income taxes	—			187		—			194
Asset retirement obligations	—			10		—			7
Price risk management	—			—		195			—
Boardman Refund	4			3		—			—
Other	21			55		39			52
Total regulatory liabilities	$	25	*	$	1,409	$	234	*	$	1,389

* 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):

	June 30, 2023		December 31, 2022
Accrued employee compensation and benefits	$	58	$	66
Accrued taxes payable	25		29
Accrued interest payable	33		31
Accrued dividends payable	48		42
Regulatory liabilities—current	25		234
Margin deposits from wholesale counterparties	5		140
Other	82		99
Total accrued expenses and other current liabilities	$	276	$	641

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 June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Service cost	$	3	$	4	$	6	$	8
Interest cost*	9		7		18		14
Expected return on plan assets*	(11)		(12)		(22)		(24)
Amortization of net actuarial loss*	—		4		—		8
Net periodic benefit cost	$	1	$	3	$	2	$	6

* 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.