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Nuclear Decommissioning | 3 Months Ended
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Mar. 31, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Nuclear Decommissioning | Nuclear Decommissioning Nuclear Decommissioning Asset Retirement Obligations We have a legal obligation to decommission our nuclear power plants following the permanent cessation of operations. See Note 10 — Asset Retirement Obligations of our 2024 Form 10-K for additional information regarding AROs and the financial statement impact of changes in estimate. The following table provides a rollforward of the nuclear decommissioning AROs reflected in the Consolidated Balance Sheets from December 31, 2024 to March 31, 2025:
Balance as of December 31, 2024 | $ | 12,186 |
Accretion expense | 154 |
Net decrease due to changes in, and timing of, estimated future cash flows | (76) |
Costs incurred related to decommissioning plants | (4) |
Balance as of March 31, 2025 | $ | 12,260 |
NDT Funds We had NDT funds totaling $17,512 million and $17,321 million as of March 31, 2025 and December 31, 2024, respectively. The current portion of the NDT funds, which are included in Other current assets in our Consolidated Balance Sheets, were not material as of March 31, 2025 and December 31, 2024, respectively. See Note 16 — Supplemental Financial Information for additional information on activities of the NDT funds. Accounting Implications of the Regulatory Agreement Units See Note 1 — Basis of Presentation and Note 10 — Asset Retirement Obligations of our 2024 Form 10-K for additional information on the Regulatory Agreement Units. The following table presents our noncurrent payables to ComEd, PECO, CenterPoint, and AEP Texas reflected as Payables related to Regulatory Agreement Units in the Consolidated Balance Sheets as of March 31, 2025 and December 31, 2024:
| March 31, 2025 |  | December 31, 2024
ComEd | $ | 3,798 |  |  | $ | 3,780 |
PECO | 312 |  |  | 247 |
CenterPoint | 359 |  |  | 365 |
AEP Texas | 124 |  |  | 126 |
Payables related to Regulatory Agreement Units | $ | 4,593 |  |  | $ | 4,518 |
NRC Minimum Funding Requirements NRC regulations require that licensees of nuclear generating facilities demonstrate reasonable assurance that funds will be available in specified minimum amounts for radiological decommissioning of the facility at the end of its life. We filed our biennial decommissioning funding status report with the NRC in March 2025 for all units, including our shutdown units, except for STP units which were included in a separate report to the NRC submitted by STPNOC. The status reports demonstrated adequate decommissioning funding assurance based on trust fund values as of December 31, 2024 for all our units except for Peach Bottom Unit 1. Financial assurance for decommissioning Peach Bottom Unit 1 is provided by collections from PECO customers. See Note 10 — Asset Retirement Obligations of our 2024 Form 10-K for additional information.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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