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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations [Table Text Block] | AROs consist of the following (in millions):
| As of December 31,
| 2022 |  | 2021
Trojan decommissioning activities | $ | 170 |  |  | $ | 139 |
Utility plant | 86 |  |  | 95 |
Non-utility property | 33 |  |  | 35 |
Total asset retirement obligations | 289 |  |  | 269 |
Less: current portion * | 32 |  |  | 31 |
Noncurrent asset retirement obligations | $ | 257 |  |  | $ | 238 |
* 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,
| 2022 |  | 2021 |  | 2020
Balance as of beginning of year | $ | 269 |  |  | $ | 291 |  |  | $ | 279 |
Liabilities incurred | 1 |  |  | — |  |  | 3 |
Liabilities settled | (27) |  |  | (18) |  |  | (18) |
Accretion expense | 10 |  |  | 10 |  |  | 10 |
Revisions in estimated cash flows | 36 |  |  | (14) |  |  | 17 |
Balance as of end of year | $ | 289 |  |  | $ | 269 |  |  | $ | 291 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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