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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
FV-NI: |  |
Realized gains | $ 26 | $ 111
Realized losses | 46 | 85
AFS: |  |
Realized gains | 8 | 4
Realized losses | 32 | 23
Duke Energy Carolinas |  |
FV-NI: |  |
Realized gains | 18 | 75
Realized losses | 29 | 49
AFS: |  |
Realized gains | 5 | 3
Realized losses | 20 | 16
Progress Energy |  |
FV-NI: |  |
Realized gains | 8 | 36
Realized losses | 17 | 36
AFS: |  |
Realized gains | 3 | 1
Realized losses | 12 | 6
Duke Energy Progress |  |
FV-NI: |  |
Realized gains | 8 | 36
Realized losses | 17 | 35
AFS: |  |
Realized gains | 3 | 1
Realized losses | $ 12 | $ 5

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