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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
FV-NI: |  |  |
Realized gains | $ 129 | $ 201 | $ 724
Realized losses | 146 | 316 | 141
AFS: |  |  |
Realized gains | 44 | 28 | 56
Realized losses | 140 | 151 | 54
Duke Energy Carolinas |  |  |
FV-NI: |  |  |
Realized gains | 82 | 124 | 440
Realized losses | 79 | 177 | 96
AFS: |  |  |
Realized gains | 22 | 22 | 38
Realized losses | 65 | 86 | 37
Progress Energy |  |  |
FV-NI: |  |  |
Realized gains | 47 | 77 | 284
Realized losses | 67 | 139 | 45
AFS: |  |  |
Realized gains | 22 | 6 | 16
Realized losses | 75 | 48 | 14
Duke Energy Progress |  |  |
FV-NI: |  |  |
Realized gains | 44 | 76 | 283
Realized losses | 66 | 136 | 44
AFS: |  |  |
Realized gains | 20 | 6 | 15
Realized losses | $ 70 | $ 44 | $ 13

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