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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
FV-NI: |  |  |  |
Realized gains | $ 61 | $ 25 | $ 107 | $ 170
Realized losses | 35 | 61 | 117 | 247
AFS: |  |  |  |
Realized gains | 16 | 7 | 37 | 22
Realized losses | 45 | 40 | 104 | 105
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 43 | 16 | 70 | 109
Realized losses | 17 | 39 | 64 | 143
AFS: |  |  |  |
Realized gains | 12 | 7 | 21 | 19
Realized losses | 26 | 20 | 54 | 57
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 18 | 9 | 37 | 61
Realized losses | 18 | 22 | 53 | 104
AFS: |  |  |  |
Realized gains | 4 |  | 16 | 3
Realized losses | 19 | 9 | 50 | 32
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 15 | 9 | 34 | 60
Realized losses | 18 | 21 | 52 | 101
AFS: |  |  |  |
Realized gains | 4 |  | 15 | 3
Realized losses | $ 18 | $ 9 | $ 47 | $ 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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