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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
FV-NI: |  |  |  |
Realized gains | $ 13 | $ 60 | $ 338 | $ 161
Realized losses | 16 | 43 | 148 | 136
AFS: |  |  |  |
Realized gains | 26 | 53 | 73 | 110
Realized losses | 19 | 36 | 38 | 83
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 10 | 34 | 46 | 101
Realized losses | 12 | 26 | 82 | 95
AFS: |  |  |  |
Realized gains | 20 | 21 | 50 | 46
Realized losses | 17 | 13 | 30 | 34
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 3 | 26 | 292 | 60
Realized losses | 4 | 17 | 66 | 41
AFS: |  |  |  |
Realized gains | 6 | 31 | 17 | 62
Realized losses | 2 | 23 | 7 | 49
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 3 | 10 | 43 | 27
Realized losses | 4 | 9 | 51 | 24
AFS: |  |  |  |
Realized gains | 6 | 2 | 17 | 4
Realized losses | $ 2 |  | 7 | 2
Duke Energy Florida |  |  |  |
FV-NI: |  |  |  |
Realized gains |  | 16 | 249 | 33
Realized losses |  | 8 | $ 15 | 17
AFS: |  |  |  |
Realized gains |  | 29 |  | 58
Realized losses |  | $ 23 |  | $ 47

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