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Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | $ 61 | $ 25
Location and fair value amounts of derivatives liabilities | 324 | 300
Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 48 | 24
Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 13 | 1
Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 64 | 118
Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 260 | 182
Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 43 | 18
Location and fair value amounts of derivatives liabilities | 251 | 223
Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 | 6
Location and fair value amounts of derivatives liabilities | 73 | 53
Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Location and fair value amounts of derivatives liabilities |  | 24
Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 14 |
Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 70 |
Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 15 | 19
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 48 | 21
Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 30 | 17
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 13 | 1
Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 30 | 67
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 137 | 156
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 | 6
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 5 | 8
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 5 | 5
Not Designated as Hedging Instruments | Equity Securities Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Not Designated as Hedging Instruments | Equity Securities Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities |  | 24
Duke Energy Carolinas |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 20 |
Location and fair value amounts of derivatives liabilities | 20 | 49
Duke Energy Carolinas | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 14 |
Duke Energy Carolinas | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Duke Energy Carolinas | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 17 | 39
Duke Energy Carolinas | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 3 | 10
Duke Energy Carolinas | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 20 |
Location and fair value amounts of derivatives liabilities | 16 | 43
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 0 |
Location and fair value amounts of derivatives liabilities | 4 | 6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 14 |
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 13 | 33
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 3 | 10
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 0 |
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 4 | 6
Progress Energy |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 33 | 7
Location and fair value amounts of derivatives liabilities | 29 | 88
Progress Energy | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 27 | 7
Progress Energy | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Progress Energy | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 2 | 51
Progress Energy | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 27 | 37
Progress Energy | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 15 |
Location and fair value amounts of derivatives liabilities | 29 | 63
Progress Energy | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 | 6
Location and fair value amounts of derivatives liabilities |  | 1
Progress Energy | Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Location and fair value amounts of derivatives liabilities |  | 24
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 9 |
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 2 | 26
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 27 | 37
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 | 6
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities |  | 1
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities |  | 24
Duke Energy Progress |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 33 |
Location and fair value amounts of derivatives liabilities | 14 | 49
Duke Energy Progress | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 27 |
Duke Energy Progress | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Duke Energy Progress | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 2 | 27
Duke Energy Progress | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 12 | 22
Duke Energy Progress | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 15 |
Location and fair value amounts of derivatives liabilities | 14 | 48
Duke Energy Progress | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 |
Location and fair value amounts of derivatives liabilities |  | 1
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 9 |
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 |
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 2 | 26
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 12 | 22
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 18 |
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities |  | 1
Duke Energy Florida |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 7
Location and fair value amounts of derivatives liabilities |  | 24
Duke Energy Florida | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 7
Duke Energy Florida | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 0 | 24
Duke Energy Florida | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 0 |
Duke Energy Florida | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 6
Duke Energy Florida | Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Location and fair value amounts of derivatives liabilities |  | 24
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 6
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities |  | 24
Duke Energy Ohio |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 4
Location and fair value amounts of derivatives liabilities | 6 | 6
Duke Energy Ohio | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 3
Duke Energy Ohio | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Duke Energy Ohio | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 1 | 1
Duke Energy Ohio | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 5 | 5
Duke Energy Ohio | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 4
Duke Energy Ohio | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 6 | 6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 3
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets |  | 1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 1 | 1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 5 | 5
Duke Energy Indiana |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 | 13
Location and fair value amounts of derivatives liabilities | 1 | 1
Duke Energy Indiana | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 | 13
Duke Energy Indiana | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 1 | 1
Duke Energy Indiana | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 0 |
Duke Energy Indiana | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 | 13
Location and fair value amounts of derivatives liabilities | 1 | 1
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 6 | 13
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 1 | 1
Piedmont |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 1
Location and fair value amounts of derivatives liabilities | 122 | 117
Piedmont | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 1
Piedmont | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 15 | 7
Piedmont | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 107 | 110
Piedmont | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 1
Location and fair value amounts of derivatives liabilities | 122 | 117
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives assets | 1 | 1
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | 15 | 7
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives liabilities | $ 107 | $ 110

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