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Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | $ 87 | $ 51
Location and fair value amounts of derivatives (Liability) | 213 | 230
Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 64 | 35
Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 23 | 16
Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 32 | 66
Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 181 | 164
Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 64 | 35
Location and fair value amounts of derivatives (Liability) | 189 | 182
Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 23 | 16
Location and fair value amounts of derivatives (Liability) | 24 | 48
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 5 | 15
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 3 | 29
Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 6
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 62 | 34
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 2 | 1
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 23 | 36
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 166 | 146
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 |
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 16 |
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 6 | 1
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 14 | 12
Duke Energy Carolinas [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 2
Location and fair value amounts of derivatives (Liability) | 19 | 35
Duke Energy Carolinas [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 2
Duke Energy Carolinas [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 9 | 31
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 4
Duke Energy Carolinas [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 2
Location and fair value amounts of derivatives (Liability) | 18 | 10
Duke Energy Carolinas [Member] | Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 25
Duke Energy Carolinas [Member] | Designated As Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 25
Duke Energy Carolinas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 2
Duke Energy Carolinas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 8 | 6
Duke Energy Carolinas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 4
Progress Energy [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 5 | 3
Location and fair value amounts of derivatives (Liability) | 35 | 36
Progress Energy [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 2
Progress Energy [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Progress Energy [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 8 | 19
Progress Energy [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 27 | 17
Progress Energy [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 5 | 3
Location and fair value amounts of derivatives (Liability) | 20 | 28
Progress Energy [Member] | Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 15 | 8
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 2
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 3 | 18
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 17 | 10
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 5 | 1
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 7
Duke Energy Progress [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 2
Location and fair value amounts of derivatives (Liability) | 21 | 18
Duke Energy Progress [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 1
Duke Energy Progress [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Duke Energy Progress [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 5 | 8
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 16 | 10
Duke Energy Progress [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 4 | 2
Location and fair value amounts of derivatives (Liability) | 10 | 12
Duke Energy Progress [Member] | Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 11 | 6
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 3 | 1
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Noncurrent Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 3 | 8
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 7 | 4
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 2 |
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 9 | 6
Duke Energy Florida [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Location and fair value amounts of derivatives (Liability) | 5 | 12
Duke Energy Florida [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Duke Energy Florida [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 4 | 10
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 2
Duke Energy Florida [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Location and fair value amounts of derivatives (Liability) | 1 | 10
Duke Energy Florida [Member] | Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 4 | 2
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 1 | 1
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 10
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 3 |
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 1 | 2
Duke Energy Ohio [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 9 | 1
Location and fair value amounts of derivatives (Liability) | 4 | 5
Duke Energy Ohio [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 9 | 1
Duke Energy Ohio [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 1
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 4 | 4
Duke Energy Ohio [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 9 | 1
Duke Energy Ohio [Member] | Interest Rate Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 4 | 5
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 9 | 1
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) |  | 1
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 4 | 4
Duke Energy Indiana [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 45 | 27
Duke Energy Indiana [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 45 | 27
Duke Energy Indiana [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 45 | 27
Duke Energy Indiana [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 45 | 27
Piedmont Natural Gas [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 2 | 2
Location and fair value amounts of derivatives (Liability) | 150 | 142
Piedmont Natural Gas [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 2 | 2
Piedmont Natural Gas [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 11
Piedmont Natural Gas [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 140 | 131
Piedmont Natural Gas [Member] | Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 2 | 2
Location and fair value amounts of derivatives (Liability) | 150 | 142
Piedmont Natural Gas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Assets, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Asset) | 2 | 2
Piedmont Natural Gas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Current Liabilities, Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | 10 | 11
Piedmont Natural Gas [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Location and fair value amounts of derivatives (Liability) | $ 140 | $ 131

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