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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
FV-NI: |  |  |  |
Realized gains | $ 34 | $ 146 | $ 145 | $ 286
Realized losses | 101 | 37 | 186 | 60
AFS: |  |  |  |
Realized gains | 11 | 16 | 15 | 34
Realized losses | 42 | 18 | 65 | 31
Duke Energy Carolinas |  |  |  |
FV-NI: |  |  |  |
Realized gains | 18 | 90 | 93 | 218
Realized losses | 55 | 23 | 104 | 39
AFS: |  |  |  |
Realized gains | 9 | 12 | 12 | 25
Realized losses | 21 | 13 | 37 | 22
Progress Energy |  |  |  |
FV-NI: |  |  |  |
Realized gains | 16 | 56 | 52 | 68
Realized losses | 46 | 14 | 82 | 21
AFS: |  |  |  |
Realized gains | 2 | 3 | 3 | 7
Realized losses | 17 | 3 | 23 | 6
Duke Energy Progress |  |  |  |
FV-NI: |  |  |  |
Realized gains | 15 | 55 | 51 | 67
Realized losses | 45 | 13 | 80 | 20
AFS: |  |  |  |
Realized gains | 2 | 3 | 3 | 7
Realized losses | $ 15 | $ 3 | $ 20 | $ 6

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