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Balance Sheet Components (Tables)
 9 Months Ended
Sep. 30, 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 September 30, Nine Months Ended September 30,
Balance as of beginning of period$14 $12 
Increase in provision4 10 
Amounts written off(6)(14)
Recoveries2 6 
Balance as of end of period$14 $14 
Schedule of Other Current Assets [Table Text Block]
Other current assets consist of the following (in millions):
September 30, 2025December 31, 2024
Prepaid expenses$61 $81 
Assets from price risk management activities16 32 
Margin deposits59 125 
Other current assets$136 $238 
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block]
Electric utility plant, net consists of the following (in millions):
September 30, 2025December 31, 2024
Electric utility plant in-service*
$15,762 $14,863 
Construction work-in-progress422 567 
Total cost16,184 15,430 
Less: accumulated depreciation and amortization(5,380)(5,085)
Electric utility plant, net$10,804 $10,345 

*The Seaside Battery Energy Storage System Project was placed in-service on July 8, 2025 and, as of September 30, 2025, had $395 million reflected in Electric utility plant, net.
Schedule of Regulatory Assets and Liabilities [Text Block]
Regulatory assets and liabilities consist of the following (in millions):
September 30, 2025December 31, 2024
CurrentNoncurrentCurrentNoncurrent
Regulatory assets:
Price risk management$117 $39 $115 $70 
Pension and other postretirement plans— 84 — 84 
Trojan decommissioning activities— 165 — 161 
February 2021 ice storm and damage14 35 14 44 
January 2024 storm and damage
— 47 — 46 
Reliability contingency events
— 89 — 90 
2020 Labor Day wildfire6 15 6 18 
Wildfire mitigation46 — 43 — 
Other24 125 27 119 
Total regulatory assets$207 $599 $205 $632 
Regulatory liabilities:
Asset retirement removal costs$— $1,233 $— $1,199 
Deferred income taxes— 231 — 179 
Clearwater RAC
25 6 — 40 
Other36 21 53 22 
Total regulatory liabilities$61 
*
$1,491 $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):
September 30, 2025December 31, 2024
Accrued employee compensation and benefits$80 $80 
Accrued taxes payable60 36 
Accrued interest payable54 49 
Accrued dividends payable61 57 
Regulatory liabilities—current61 53 
Margin deposits from wholesale counterparties5 5 
Other160 130 
Total accrued expenses and other current liabilities$481 $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 September 30, Nine Months Ended September 30,
2025202420252024
Service cost$2 $3 $7 $8 
Interest cost*8 8 24 25 
Expected return on plan assets*(9)(10)(27)(30)
Net periodic benefit cost$1 $1 $4 $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.