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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations [Table Text Block] | AROs consist of the following (in millions):
| As of December 31,
| 2023 |  | 2022
Trojan decommissioning activities | $ | 174 |  |  | $ | 170 |
Utility plant | 85 |  |  | 86 |
Non-utility property | 27 |  |  | 33 |
Total asset retirement obligations | 286 |  |  | 289 |
Less: current portion * | 14 |  |  | 32 |
Noncurrent asset retirement obligations | $ | 272 |  |  | $ | 257 |
* Current portion of AROs are classified within Accrued expenses and other current liabilities in the consolidated balance sheets.
Schedule of Change in Asset Retirement Obligation [Table Text Block] | The following is a summary of the changes in the Company’s AROs (in millions):
| Years Ended December 31,
| 2023 |  | 2022 |  | 2021
Balance as of beginning of year | $ | 289 |  |  | $ | 269 |  |  | $ | 291 |
Liabilities incurred | 2 |  |  | 1 |  |  | — |
Liabilities settled | (25) |  |  | (27) |  |  | (18) |
Accretion expense | 11 |  |  | 10 |  |  | 10 |
Revisions in estimated cash flows | 9 |  |  | 36 |  |  | (14) |
Balance as of end of year | $ | 286 |  |  | $ | 289 |  |  | $ | 269 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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