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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
FV-NI: |  |  |  |
Realized gains | $ 848 | $ 61 | $ 1,015 | $ 256
Realized losses | 21 | 19 | 102 | 64
AFS: |  |  |  |
Realized gains | 23 | 10 | 43 | 22
Realized losses | 20 | 8 | 57 | 44
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 490 | 38 | 594 | 163
Realized losses | 12 | 9 | 53 | 30
AFS: |  |  |  |
Realized gains | 17 | 6 | 32 | 11
Realized losses | 17 | 5 | 40 | 22
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 358 | 23 | 421 | 93
Realized losses | 9 | 10 | 49 | 34
AFS: |  |  |  |
Realized gains | 6 | 4 | 11 | 11
Realized losses | 3 | 3 | 17 | 22
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 358 | 23 | 419 | 93
Realized losses | 9 | 10 | 49 | 34
AFS: |  |  |  |
Realized gains | 5 | 4 | 10 | 11
Realized losses | $ 3 | $ 3 | $ 16 | $ 21

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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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