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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
FV-NI: |  |  |
Realized gains | $ 201 | $ 724 | $ 366
Realized losses | 316 | 141 | 174
AFS: |  |  |
Realized gains | 28 | 56 | 96
Realized losses | 151 | 54 | 51
Duke Energy Carolinas |  |  |
FV-NI: |  |  |
Realized gains | 124 | 440 | 64
Realized losses | 177 | 96 | 99
AFS: |  |  |
Realized gains | 22 | 38 | 60
Realized losses | 86 | 37 | 37
Progress Energy |  |  |
FV-NI: |  |  |
Realized gains | 77 | 284 | 302
Realized losses | 139 | 45 | 75
AFS: |  |  |
Realized gains | 6 | 16 | 24
Realized losses | 48 | 14 | 13
Duke Energy Progress |  |  |
FV-NI: |  |  |
Realized gains | 76 | 283 | 52
Realized losses | 136 | 44 | 59
AFS: |  |  |
Realized gains | 6 | 15 | 24
Realized losses | 44 | 13 | 13
Duke Energy Florida |  |  |
FV-NI: |  |  |
Realized gains | 1 | 1 | 250
Realized losses | 3 | 1 | $ 16
AFS: |  |  |
Realized gains |  | 1 |
Realized losses | $ 4 | $ 1 |

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