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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, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | $ 25 | $ 57
Location and fair value amounts of derivatives (Liability) | 300 | 242
Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 24 | 38
Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 19
Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 118 | 68
Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 182 | 174
Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 18 | 39
Location and fair value amounts of derivatives (Liability) | 223 | 191
Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 6 | 18
Location and fair value amounts of derivatives (Liability) | 53 | 51
Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Location and fair value amounts of derivatives (Liability) | 24 |
Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 1
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 3
Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 19 | 12
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 21 | 6
Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 17 | 35
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 4
Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 67 | 33
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 156 | 158
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 6 | 2
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 8 | 23
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 5 | 10
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 12
Not Designated as Hedging Instruments | Equity Securities Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Not Designated as Hedging Instruments | Equity Securities Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 24 |
Duke Energy Carolinas |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 3
Location and fair value amounts of derivatives (Liability) | 49 | 33
Duke Energy Carolinas | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Carolinas | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 1
Duke Energy Carolinas | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 39 | 23
Duke Energy Carolinas | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 10
Duke Energy Carolinas | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 3
Location and fair value amounts of derivatives (Liability) | 43 | 24
Duke Energy Carolinas | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 6 | 9
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 1
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 33 | 14
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 10
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 (Liability) | 6 | 9
Progress Energy |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 7 | 4
Location and fair value amounts of derivatives (Liability) | 88 | 44
Progress Energy | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 7 | 2
Progress Energy | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Progress Energy | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 51 | 23
Progress Energy | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 37 | 21
Progress Energy | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 4
Location and fair value amounts of derivatives (Liability) | 63 | 25
Progress Energy | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 6 |
Location and fair value amounts of derivatives (Liability) | 1 | 19
Progress Energy | Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Location and fair value amounts of derivatives (Liability) | 24 |
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 26 | 10
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 37 | 15
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 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 (Liability) | 1 | 13
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 6
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 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 (Liability) | 24 |
Duke Energy Progress |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 4
Location and fair value amounts of derivatives (Liability) | 49 | 27
Duke Energy Progress | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Progress | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Progress | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 27 | 16
Duke Energy Progress | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 22 | 11
Duke Energy Progress | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 4
Location and fair value amounts of derivatives (Liability) | 48 | 11
Duke Energy Progress | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 16
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 26 | 5
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 22 | 6
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 (Liability) | 1 | 11
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 5
Duke Energy Florida |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 7 |
Location and fair value amounts of derivatives (Liability) | 24 | 9
Duke Energy Florida | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 7 |
Duke Energy Florida | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 24 | 8
Duke Energy Florida | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 1
Duke Energy Florida | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 6
Duke Energy Florida | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 6 |
Location and fair value amounts of derivatives (Liability) |  | 3
Duke Energy Florida | Equity Securities Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Location and fair value amounts of derivatives (Liability) | 24 |
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 6
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 (Asset) | 6 |
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 2
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 1
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 (Asset) | 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 (Liability) | 24 |
Duke Energy Ohio |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 6
Location and fair value amounts of derivatives (Liability) | 6 | 5
Duke Energy Ohio | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 6
Duke Energy Ohio | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Duke Energy Ohio | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 1
Duke Energy Ohio | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 5 | 4
Duke Energy Ohio | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 6
Duke Energy Ohio | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 6 | 5
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 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 (Liability) | 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 (Liability) | 5 | 4
Duke Energy Indiana |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 13 | 23
Location and fair value amounts of derivatives (Liability) | 1 |
Duke Energy Indiana | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 13 | 23
Duke Energy Indiana | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 |
Duke Energy Indiana | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 13 | 23
Location and fair value amounts of derivatives (Liability) | 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 (Asset) | 13 | 23
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 |
Piedmont |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 3
Location and fair value amounts of derivatives (Liability) | 117 | 141
Piedmont | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 3
Piedmont | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 7 | 8
Piedmont | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 110 | 133
Piedmont | Commodity Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 3
Location and fair value amounts of derivatives (Liability) | 117 | 141
Piedmont | Interest Rate Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 0
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 3
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) |  | 0
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 7 | 8
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | $ 110 | $ 133

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