v2.4.0.8
Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Line of Credit Facility [Line Items]  
Facility size $ 6,000
Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 6,000 [1]
Commercial paper (1,278) [2]
Outstanding letters of credit (64)
Tax exempt bonds (116)
Available capacity 4,542
Parent Company [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 2,250 [1]
Commercial paper (784) [2]
Outstanding letters of credit (56)
Tax exempt bonds 0
Available capacity 1,410
Parent Company [Member] | Proceeds Loaned To Subsidiary Registrants [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Commercial paper (450)
Duke Energy Carolinas [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 1,000 [1]
Commercial paper (300) [2]
Outstanding letters of credit (4)
Tax exempt bonds (35)
Available capacity 661
Duke Energy Progress [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 750 [1]
Commercial paper (27)
Outstanding letters of credit (2)
Tax exempt bonds 0
Available capacity 721
Duke Energy Florida [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 650 [1]
Commercial paper 0
Outstanding letters of credit (1)
Tax exempt bonds 0
Available capacity 649
Duke Energy Ohio [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 650 [1]
Commercial paper (4)
Outstanding letters of credit 0
Tax exempt bonds 0
Available capacity 646
Duke Energy Indiana [Member] | Revolving Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Facility size 700 [1]
Commercial paper (163) [2]
Outstanding letters of credit (1)
Tax exempt bonds (81)
Available capacity $ 455
[1] Represents the sublimit of each borrower.
[2] Duke Energy issued $450 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas and Duke Energy Indiana. The balances are classified within Long-Term Debt Payable to Affiliated Companies in Duke Energy Carolinas' and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.