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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
FV-NI: |  |  |  |
Realized gains | $ 20 | $ 34 | $ 46 | $ 145
Realized losses | 36 | 101 | 82 | 186
AFS: |  |  |  |
Realized gains | 13 | 11 | 21 | 15
Realized losses | 27 | 42 | 59 | 65
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 9 | 18 | 27 | 93
Realized losses | 18 | 55 | 47 | 104
AFS: |  |  |  |
Realized gains | 4 | 9 | 9 | 12
Realized losses | 8 | 21 | 28 | 37
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 11 | 16 | 19 | 52
Realized losses | 18 | 46 | 35 | 82
AFS: |  |  |  |
Realized gains | 9 | 2 | 12 | 3
Realized losses | 19 | 17 | 31 | 23
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 11 | 15 | 19 | 51
Realized losses | 17 | 45 | 34 | 80
AFS: |  |  |  |
Realized gains | 8 | 2 | 11 | 3
Realized losses | $ 17 | $ 15 | $ 29 | $ 20

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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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