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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
FV-NI: |  |  |  |
Realized gains | $ 41 | $ 127 | $ 167 | $ 195
Realized losses | 40 | 27 | 81 | 45
AFS: |  |  |  |
Realized gains | 10 | 2 | 20 | 12
Realized losses | 17 | 22 | 37 | 36
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 22 | 72 | 104 | 125
Realized losses | 19 | 15 | 41 | 21
AFS: |  |  |  |
Realized gains | 8 | 1 | 15 | 5
Realized losses | 9 | 11 | 23 | 17
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 19 | 55 | 63 | 70
Realized losses | 21 | 12 | 40 | 24
AFS: |  |  |  |
Realized gains | 2 | 1 | 5 | 7
Realized losses | 8 | 11 | 14 | 19
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 17 | 55 | 61 | 70
Realized losses | 21 | 12 | 40 | 24
AFS: |  |  |  |
Realized gains | 2 | 1 | 5 | 7
Realized losses | $ 7 | $ 10 | $ 13 | $ 18

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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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