|
Business Segments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
|
| Segment Reporting Information [Line Items] | ||||
| Interest Expense | $ 405 | $ 378 | $ 1,212 | $ 1,125 |
|
Progress Energy [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Interest Expense | 166 | 162 | 502 | 520 |
|
Duke Energy Ohio [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Interest Expense | 20 | 14 | 60 | 47 |
|
Other [Member] | Progress Energy [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Interest Expense | $ 58 | $ 64 | $ 181 | $ 235 |
|
National Methanol Company [Member] | International Energy [Member]
|
||||
| Segment Reporting Information [Line Items] | ||||
| Equity Method Investment, Ownership Percentage | 25.00% | 25.00% | ||