|
Related Party Transactions (Narrative)(Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 3 Months Ended | 1 Months Ended | 1 Months Ended | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
Duke Energy Carolinas [Member]
|
Dec. 31, 2012
Duke Energy Carolinas [Member]
|
Mar. 31, 2013
Progress Energy [Member]
|
Dec. 31, 2012
Progress Energy [Member]
|
Mar. 31, 2013
Duke Energy Progress [Member]
|
Mar. 31, 2012
Duke Energy Progress [Member]
|
Dec. 31, 2012
Duke Energy Progress [Member]
|
Mar. 31, 2013
Duke Energy Florida [Member]
|
Mar. 31, 2012
Duke Energy Florida [Member]
|
Dec. 31, 2012
Duke Energy Florida [Member]
|
Jan. 31, 2012
Duke Energy Ohio [Member]
|
Mar. 31, 2013
Duke Energy Ohio [Member]
|
Dec. 31, 2012
Duke Energy Ohio [Member]
|
Jan. 31, 2012
Duke Energy Indiana [Member]
|
Mar. 31, 2013
Duke Energy Indiana [Member]
|
Dec. 31, 2012
Duke Energy Indiana [Member]
|
Mar. 31, 2013
DECAM [Member]
|
Dec. 31, 2012
DECAM [Member]
|
|
| Related Party Transaction [Line Items] | ||||||||||||||||||
| DECAM Intercompany Loan Receivable | $ 397 | $ 382 | $ 20 | $ 0 | $ 0 | $ 207 | $ 4 | $ 1 | ||||||||||
| Dividends paid to parent | 0 | (175) | 0 | (105) | ||||||||||||||
| Transfer of Vermillion generation station | 28 | 26 | ||||||||||||||||
| DECAM Intercompany Loan Payable | $ 980 | $ 455 | $ 38 | $ 364 | $ 238 | $ 0 | $ 337 | $ 245 | $ 27 | $ 81 | $ 99 | $ 79 | ||||||