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Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
Balance as of beginning of period | $ | 11 |  |  | $ | 9 |
Increase in provision | 2 |  |  | 5 |
Amounts written off | (4) |  |  | (6) |
Recoveries | 2 |  |  | 3 |
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):
| June 30, 2024 |  | December 31, 2023
Prepaid expenses | $ | 83 |  |  | $ | 68 |
Assets from price risk management activities | 37 |  |  | 22 |
Margin deposits | 55 |  |  | 92 |
Other current assets | $ | 175 |  |  | $ | 182 |
Schedule of Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consists of the following (in millions):
| June 30, 2024 |  | December 31, 2023
Electric utility plant in-service | $ | 14,126 |  |  | $ | 13,329 |
Construction work-in-progress | 690 |  |  | 974 |
Total cost | 14,816 |  |  | 14,303 |
Less: accumulated depreciation and amortization | (4,943) |  |  | (4,757) |
Electric utility plant, net | $ | 9,873 |  |  | $ | 9,546 |
Schedule of Regulatory Assets and Liabilities [Text Block] | Regulatory assets and liabilities consist of the following (in millions):
| June 30, 2024 |  | December 31, 2023
| Current |  | Noncurrent |  | Current |  | Noncurrent
Regulatory assets: |  |  |  |  |  |  |
Price risk management | $ | 105 |  |  | $ | 48 |  |  | $ | 143 |  |  | $ | 63 |
Reliability contingency events | — |  |  | 77 |  |  | — |  |  | — |
Pension and other postretirement plans | — |  |  | 104 |  |  | — |  |  | 104 |
Trojan decommissioning activities | — |  |  | 142 |  |  | — |  |  | 139 |
February 2021 ice storm and damage | 13 |  |  | 50 |  |  | 12 |  |  | 55 |
January 2024 storm and damage | — |  |  | 44 |  |  | — |  |  | — |
2020 Labor Day wildfire | 5 |  |  | 21 |  |  | 5 |  |  | 23 |
Wildfire mitigation | 19 |  |  | 21 |  |  | 19 |  |  | 10 |
Other | 23 |  |  | 110 |  |  | 42 |  |  | 98 |
Total regulatory assets | $ | 165 |  |  | $ | 617 |  |  | $ | 221 |  |  | $ | 492 |
Regulatory liabilities: |  |  |  |  |  |  |
Asset retirement removal costs | $ | — |  |  | $ | 1,188 |  |  | $ | — |  |  | $ | 1,173 |
Deferred income taxes | — |  |  | 167 |  |  | — |  |  | 177 |
Clearwater RAC | — |  |  | 13 |  |  | — |  |  | — |
Other | 55 |  |  | 38 |  |  | 48 |  |  | 48 |
Total regulatory liabilities | $ | 55 |  | * | $ | 1,406 |  |  | $ | 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):
| June 30, 2024 |  | December 31, 2023
Accrued employee compensation and benefits | $ | 56 |  |  | $ | 74 |
Accrued taxes payable | 28 |  |  | 30 |
Accrued interest payable | 48 |  |  | 40 |
Accrued dividends payable | 53 |  |  | 51 |
Regulatory liabilities—current | 55 |  |  | 48 |
Other | 105 |  |  | 112 |
Total accrued expenses and other current liabilities | $ | 345 |  |  | $ | 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 June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Service cost | $ | 3 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 6 |
Interest cost* | 8 |  |  | 9 |  |  | 17 |  |  | 18 |
Expected return on plan assets* | (10) |  |  | (11) |  |  | (20) |  |  | (22) |
Net periodic benefit cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
* 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.

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