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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
FV-NI: |  |
Realized gains | $ 111 | $ 140
Realized losses | 85 | 23
AFS: |  |
Realized gains | 4 | 18
Realized losses | 23 | 13
Duke Energy Carolinas |  |
FV-NI: |  |
Realized gains | 75 | 128
Realized losses | 49 | 16
AFS: |  |
Realized gains | 3 | 13
Realized losses | 16 | 9
Progress Energy |  |
FV-NI: |  |
Realized gains | 36 | 12
Realized losses | 36 | 7
AFS: |  |
Realized gains | 1 | 4
Realized losses | 6 | 3
Duke Energy Progress |  |
FV-NI: |  |
Realized gains | 36 | 12
Realized losses | 35 | 7
AFS: |  |
Realized gains | 1 | 4
Realized losses | $ 5 | $ 3

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