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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations [Table Text Block] | AROs consist of the following (in millions):
| As of December 31,
| 2021 |  | 2020
Trojan decommissioning activities | $ | 139 |  |  | $ | 139 |
Utility plant | 95 |  |  | 118 |
Non-utility property | 35 |  |  | 34 |
Total asset retirement obligations | 269 |  |  | 291 |
Less: current portion * | 31 |  |  | 21 |
Noncurrent asset retirement obligations | $ | 238 |  |  | $ | 270 |
* 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,
| 2021 |  | 2020 |  | 2019
Balance as of beginning of year | $ | 291 |  |  | $ | 279 |  |  | $ | 197 |
Liabilities incurred | — |  |  | 3 |  |  | — |
Liabilities settled | (18) |  |  | (18) |  |  | (9) |
Accretion expense | 10 |  |  | 10 |  |  | 9 |
Revisions in estimated cash flows | (14) |  |  | 17 |  |  | 82 |
Balance as of end of year | $ | 269 |  |  | $ | 291 |  |  | $ | 279 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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