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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
FV-NI: |  |  |  |
Realized gains | $ 127 | $ 20 | $ 195 | $ 46
Realized losses | 27 | 36 | 45 | 82
AFS: |  |  |  |
Realized gains | 2 | 13 | 12 | 21
Realized losses | 22 | 27 | 36 | 59
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 72 | 9 | 125 | 27
Realized losses | 15 | 18 | 21 | 47
AFS: |  |  |  |
Realized gains | 1 | 4 | 5 | 9
Realized losses | 11 | 8 | 17 | 28
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 55 | 11 | 70 | 19
Realized losses | 12 | 18 | 24 | 35
AFS: |  |  |  |
Realized gains | 1 | 9 | 7 | 12
Realized losses | 11 | 19 | 19 | 31
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 55 | 11 | 70 | 19
Realized losses | 12 | 17 | 24 | 34
AFS: |  |  |  |
Realized gains | 1 | 8 | 7 | 11
Realized losses | $ 10 | $ 17 | $ 18 | $ 29

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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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