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Balance Sheet Components (Tables)
 9 Months Ended
Sep. 30, 2024
Balance Sheet Components [Abstract]  
Allowance for Credit Losses [Text Block] The following summarizes activity during 2024 in the allowance for credit losses (in millions):
Three Months Ended September 30, Nine Months Ended September 30,
Balance as of beginning of period$11 $9 
Increase in provision3 8 
Amounts written off(5)(11)
Recoveries2 5 
Balance as of end of period$11 $11 
Schedule of Other Current Assets [Table Text Block]
Other current assets consist of the following (in millions):
September 30, 2024December 31, 2023
Prepaid expenses$45 $68 
Assets from price risk management activities20 22 
Margin deposits91 92 
Other current assets$156 $182 
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):         
September 30, 2024December 31, 2023
Electric utility plant in-service$14,253 $13,329 
Construction work-in-progress803 974 
Total cost15,056 14,303 
Less: accumulated depreciation and amortization(4,981)(4,757)
Electric utility plant, net$10,075 $9,546 
Schedule of Regulatory Assets and Liabilities [Text Block]
Regulatory assets and liabilities consist of the following (in millions):
September 30, 2024December 31, 2023
CurrentNoncurrentCurrentNoncurrent
Regulatory assets:
Price risk management$94 $73 $143 $63 
Pension and other postretirement plans— 104 — 104 
Trojan decommissioning activities— 142 — 139 
February 2021 ice storm and damage13 48 12 55 
January 2024 storm and damage
— 28 — — 
Reliability contingency events
— 89 — — 
2020 Labor Day wildfire5 20 5 23 
Wildfire mitigation41 — 19 10 
Other32 115 42 98 
Total regulatory assets$185 $619 $221 $492 
Regulatory liabilities:
Asset retirement removal costs$— $1,193 $— $1,173 
Deferred income taxes— 164 — 177 
Clearwater RAC
— 26 — — 
Other55 30 48 48 
Total regulatory liabilities$55 
*
$1,413 $48 
*
$1,398 
* 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):
September 30, 2024December 31, 2023
Accrued employee compensation and benefits$75 $74 
Accrued taxes payable56 30 
Accrued interest payable54 40 
Accrued dividends payable54 51 
Regulatory liabilities—current55 48 
Other107 112 
Total accrued expenses and other current liabilities$401 $355 
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 September 30, Nine Months Ended September 30,
2024202320242023
Service cost$3 $3 $8 $9 
Interest cost*8 9 25 27 
Expected return on plan assets*(10)(11)(30)(33)
Net periodic benefit cost$1 $1 $3 $3 

* 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.