|
Fair Value Of Financial Assets And Liabilities (Additional Fair Value Disclosure) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
|
Dec. 31, 2012
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | $ 44,068 | $ 44,001 | ||||||
| Debt of variable interest entities | 1,255 | 852 | ||||||
| Long-term Debt | 39,662 | [1] | 39,461 | [1] | ||||
|
Duke Energy Carolinas [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 10,036 | 10,096 | ||||||
| Debt of variable interest entities | 300 | 300 | ||||||
| Long-term Debt | 8,740 | [2] | 8,741 | [2] | ||||
|
Progress Energy [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 16,276 | 16,563 | ||||||
| Long-term Debt | 14,224 | 14,428 | ||||||
|
Duke Energy Progress [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 5,757 | 5,277 | ||||||
| Long-term Debt | 5,336 | 4,840 | ||||||
|
Duke Energy Florida [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 5,730 | 6,222 | ||||||
| Long-term Debt | 4,894 | 5,320 | ||||||
|
Duke Energy Ohio [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 2,142 | 2,117 | ||||||
| Long-term Debt | 1,994 | 1,997 | ||||||
|
Duke Energy Indiana [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||||
| Long-term Debt, Fair Value | 4,228 | 4,268 | ||||||
| Long-term Debt | $ 3,702 | $ 3,702 | ||||||
|
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