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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
FV-NI: |  |  |
Realized gains | $ 1,174 | $ 600 | $ 129
Realized losses | 145 | 85 | 146
AFS: |  |  |
Realized gains | 67 | 28 | 44
Realized losses | 77 | 67 | 140
Duke Energy Carolinas |  |  |
FV-NI: |  |  |
Realized gains | 693 | 298 | 82
Realized losses | 77 | 40 | 79
AFS: |  |  |
Realized gains | 51 | 14 | 22
Realized losses | 57 | 40 | 65
Progress Energy |  |  |
FV-NI: |  |  |
Realized gains | 481 | 302 | 47
Realized losses | 68 | 45 | 67
AFS: |  |  |
Realized gains | 16 | 14 | 22
Realized losses | 20 | 27 | 75
Duke Energy Progress |  |  |
FV-NI: |  |  |
Realized gains | 478 | 288 | 44
Realized losses | 67 | 44 | 66
AFS: |  |  |
Realized gains | 15 | 13 | 20
Realized losses | $ 19 | $ 26 | $ 70

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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