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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
FV-NI: |  |  |
Realized gains | $ 724 | $ 366 | $ 172
Realized losses | 141 | 174 | 151
AFS: |  |  |
Realized gains | 56 | 96 | 94
Realized losses | 54 | 51 | 67
Duke Energy Carolinas |  |  |
FV-NI: |  |  |
Realized gains | 440 | 64 | 113
Realized losses | 96 | 99 | 107
AFS: |  |  |
Realized gains | 38 | 60 | 55
Realized losses | 37 | 37 | 38
Progress Energy |  |  |
FV-NI: |  |  |
Realized gains | 284 | 302 | 59
Realized losses | 45 | 75 | 44
AFS: |  |  |
Realized gains | 16 | 24 | 36
Realized losses | 14 | 13 | 29
Duke Energy Progress |  |  |
FV-NI: |  |  |
Realized gains | 283 | 52 | 38
Realized losses | 44 | 59 | 33
AFS: |  |  |
Realized gains | 15 | 24 | 7
Realized losses | 13 | 13 | 5
Duke Energy Florida |  |  |
FV-NI: |  |  |
Realized gains | 1 | 250 | 21
Realized losses | 1 | $ 16 | 11
AFS: |  |  |
Realized gains | 1 |  | 29
Realized losses | $ 1 |  | $ 24

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