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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
FV-NI: |  |  |
Realized gains | $ 172 | $ 168 |
Realized losses | 151 | 126 |
AFS: |  |  |
Realized gains | 94 | 22 |
Realized losses | 67 | 51 |
Available-for-sale Securities, Realized Gain (Loss) [Abstract] |  |  |
Realized gains |  |  | $ 202
Realized losses |  |  | 160
Duke Energy Carolinas |  |  |
FV-NI: |  |  |
Realized gains | 113 | 89 |
Realized losses | 107 | 73 |
AFS: |  |  |
Realized gains | 55 | 19 |
Realized losses | 38 | 35 |
Available-for-sale Securities, Realized Gain (Loss) [Abstract] |  |  |
Realized gains |  |  | 135
Realized losses |  |  | 103
Progress Energy |  |  |
FV-NI: |  |  |
Realized gains | 59 | 79 |
Realized losses | 44 | 53 |
AFS: |  |  |
Realized gains | 36 | 3 |
Realized losses | 29 | 15 |
Available-for-sale Securities, Realized Gain (Loss) [Abstract] |  |  |
Realized gains |  |  | 65
Realized losses |  |  | 56
Duke Energy Progress |  |  |
FV-NI: |  |  |
Realized gains | 38 | 68 |
Realized losses | 33 | 48 |
AFS: |  |  |
Realized gains | 7 | 2 |
Realized losses | 5 | 10 |
Available-for-sale Securities, Realized Gain (Loss) [Abstract] |  |  |
Realized gains |  |  | 54
Realized losses |  |  | 48
Duke Energy Florida |  |  |
FV-NI: |  |  |
Realized gains | 21 | 11 |
Realized losses | 11 | 5 |
AFS: |  |  |
Realized gains | 29 | 1 |
Realized losses | $ 24 | $ 5 |
Available-for-sale Securities, Realized Gain (Loss) [Abstract] |  |  |
Realized gains |  |  | 11
Realized losses |  |  | $ 8

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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