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Balance Sheet Components (Tables) | 12 Months Ended
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Dec. 31, 2023
Balance Sheet Components [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | The following is the activity in the allowance for uncollectible accounts (in millions):
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Balance as of beginning of year | $ | 12 |  |  | $ | 26 |  |  | $ | 16 |
(Decrease)/Increase in provision * | 5 |  |  | (2) |  |  | 35 |
Amounts written off, less recoveries | (8) |  |  | (12) |  |  | (25) |
Balance as of end of year | $ | 9 |  |  | $ | 12 |  |  | $ | 26 |
* Pursuant to the Company’s COVID-19 deferral, certain decreases and increases in the provision for bad debt have been deferred as a net Regulatory Asset. Of the amounts recorded as decreases and increases in the provision, reductions of $10 million and increases of $29 million for the years ended December 31, 2022 and December 31, 2021, respectively, have been offset within the COVID-19 Regulatory Asset. See Note 7, Regulatory Assets and Liabilities for more information.
Schedule of Other Assets and Other Liabilities [Table Text Block] | Other current assets and Accrued expenses and other current liabilities consist of the following (in millions):
| As of December 31,
| 2023 |  | 2022
Other current assets: |  |  |
Prepaid expenses | $ | 68 |  |  | $ | 69 |
Margin deposits | 92 |  |  | 116 |
Assets from price risk management activities | 22 |  |  | 313 |
| $ | 182 |  |  | $ | 498 |
Accrued expenses and other current liabilities: |  |  |
Regulatory liabilities—current | $ | 48 |  |  | $ | 234 |
Accrued employee compensation and benefits | 74 |  |  | 66 |
Accrued dividends payable | 51 |  |  | 42 |
Accrued interest payable | 40 |  |  | 31 |
Accrued taxes payable | 30 |  |  | 29 |
Margin deposits from wholesale counterparties | 5 |  |  | 140 |
Other | 107 |  |  | 99 |
| $ | 355 |  |  | $ | 641 |
Public Utility Property, Plant, and Equipment [Table Text Block] | Electric utility plant, net consist of the following (in millions):
| As of December 31,
| 2023 |  | 2022
Electric utility plant: |  |  |
Generation | $ | 4,986 |  |  | $ | 4,709 |
Transmission | 1,144 |  |  | 1,119 |
Distribution | 5,252 |  |  | 4,813 |
General | 1,014 |  |  | 973 |
Intangible | 933 |  |  | 807 |
Total in service | 13,329 |  |  | 12,421 |
Accumulated depreciation and amortization | (4,757) |  |  | (4,423) |
Total in service, net | 8,572 |  |  | 7,998 |
Construction work-in-progress * | 974 |  |  | 467 |
Electric utility plant, net | $ | 9,546 |  |  | $ | 8,465 |
*The Clearwater Wind Project, with $411 million in CWIP, was placed in-service on January 5, 2024.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481834/980-20-45-1 + Details
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