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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
FV-NI: |  |
Realized gains | $ 68 | $ 26
Realized losses | 18 | 46
AFS: |  |
Realized gains | 10 | 8
Realized losses | 14 | 32
Duke Energy Carolinas |  |
FV-NI: |  |
Realized gains | 53 | 18
Realized losses | 6 | 29
AFS: |  |
Realized gains | 4 | 5
Realized losses | 6 | 20
Progress Energy |  |
FV-NI: |  |
Realized gains | 15 | 8
Realized losses | 12 | 17
AFS: |  |
Realized gains | 6 | 3
Realized losses | 8 | 12
Duke Energy Progress |  |
FV-NI: |  |
Realized gains | 15 | 8
Realized losses | 12 | 17
AFS: |  |
Realized gains | 6 | 3
Realized losses | $ 8 | $ 12

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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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