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Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | $ 9,156 | $ 12,728
Accretion expense | 434 | 523
Liabilities settled | (634) | (758)
Liabilities incurred in the current year | 20 | 29
Revisions in estimates of cash flows | 1,016 | (3,366)
Ending Balance | 9,992 | 9,156
Duke Energy Carolinas |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 4,013 | 5,382
Accretion expense | 183 | 254
Liabilities settled | (212) | (256)
Liabilities incurred in the current year | 8 | 3
Revisions in estimates of cash flows | (2) | (1,370)
Ending Balance | 3,990 | 4,013
Progress Energy |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 4,145 | 6,181
Accretion expense | 199 | 237
Liabilities settled | (321) | (379)
Liabilities incurred in the current year | 12 | 21
Revisions in estimates of cash flows | 513 | (1,915)
Ending Balance | 4,548 | 4,145
Duke Energy Progress |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 3,870 | 5,823
Accretion expense | 190 | 225
Liabilities settled | (232) | (292)
Liabilities incurred in the current year |  | 6
Revisions in estimates of cash flows | 506 | (1,892)
Ending Balance | 4,334 | 3,870
Duke Energy Florida |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 275 | 358
Accretion expense | 9 | 12
Liabilities settled | (89) | (87)
Liabilities incurred in the current year | 12 | 15
Revisions in estimates of cash flows | 7 | (23)
Ending Balance | 214 | 275
Duke Energy Ohio |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 136 | 154
Accretion expense | 7 | 7
Liabilities settled | (7) | (15)
Liabilities incurred in the current year |  | 1
Revisions in estimates of cash flows | 3 | (11)
Ending Balance | 139 | 136
Duke Energy Indiana |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 809 | 951
Accretion expense | 49 | 33
Liabilities settled | (94) | (108)
Liabilities incurred in the current year |  | 4
Revisions in estimates of cash flows | 504 | (71)
Ending Balance | 1,268 | 809
Piedmont |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 26 | 26
Accretion expense | 2 | 1
Revisions in estimates of cash flows | 1 | (1)
Ending Balance | $ 29 | $ 26

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement 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 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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