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Employee Benefit Plans (Tables)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]        
Employee Savings Plan Contributions    
               
 Three Months Ended September 30, Nine Months Ended September 30,
(in millions)  2013  2012   2013  2012
Duke Energy $30 $30  $ 101 $ 77
Duke Energy Carolinas  10  8    34   28
Progress Energy  12  12    34   35
Duke Energy Progress  7  7    19   18
Duke Energy Florida  4  4    11   11
Duke Energy Ohio   ―  1    2   3
Duke Energy Indiana  2  2    5   5
               
  
Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 41 $ 12 $ 15 $ 6 $ 8 $ 1 $ 2
Interest cost on projected benefit obligation  80   20   29   13   13   5   7
Expected return on plan assets  (137)   (37)   (50)   (24)   (21)   (7)   (11)
Amortization of prior service credit  (2)   (2)   (1)   (1)   (1)   ―   ―
Amortization of actuarial loss  61   15   26   11   12   3   6
Other  2   1   ―   1   ―   ―   1
Net periodic pension costs(a)(b)$ 45 $ 9 $ 19 $ 6 $ 11 $ 2 $ 5
                      
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 39 $ 9 $ 16 $ 6 $ 8 $ 2 $ 2
Interest cost on projected benefit obligation  94   23   32   15   14   7   8
Expected return on plan assets  (142)   (36)   (48)   (25)   (21)   (11)   (12)
Amortization of prior service cost  3   ―   2   2   ―   ―   1
Amortization of actuarial loss  47   11   24   9   13   2   3
Other  2   ―   1   1   ―   ―   ―
Net periodic pension costs(a)(b)$ 43 $ 7 $ 27 $ 8 $ 14 $ ― $ 2
                      
(a)Duke Energy amounts exclude $3 million for each of the three months ended September 30, 2013 and 2012, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
(b)Duke Energy Ohio amounts exclude $1 million and $2 million for the three months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
                      
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 125 $ 37 $ 45 $ 17 $ 23 $ 4 $ 8
Interest cost on projected benefit obligation  240   60   87   38   40   16   21
Expected return on plan assets  (411)   (111)   (149)   (71)   (65)   (22)   (33)
Amortization of prior service credit  (8)   (5)   (3)   (1)   (2)   ―   ―
Amortization of actuarial loss  183   45   76   34   37   9   17
Other  5   2   1   1   ―   ―   1
Net periodic pension costs(a)(b)$ 134 $ 28 $ 57 $ 18 $ 33 $ 7 $ 14
                      
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 84 $ 26 $ 47 $ 19 $ 22 $ 5 $ 7
Interest cost on projected benefit obligation  214   68   95   43   42   23   23
Expected return on plan assets  (330)   (109)   (141)   (72)   (61)   (33)   (35)
Amortization of prior service cost  6   1   7   6   ―   ―   2
Amortization of actuarial loss  96   34   69   28   36   7   10
Other  4   1   1   1   ―   ―   ―
Net periodic pension costs(a)(b)$ 74 $ 21 $ 78 $ 25 $ 39 $ 2 $ 7
                      
(a)Duke Energy amounts exclude $9 million and $10 million for the nine months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
(b)Duke Energy Ohio amounts exclude $4 million and $5 million for the nine months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
                      
Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  3   ―   1   ―   ―
Amortization of actuarial loss  1   ―   1   1   1
Net periodic pension costs$ 5 $ ― $ 3 $ 2 $ 1
                
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Interest cost on projected benefit obligation$ 5 $ ― $ 2 $ 1 $ 1
Amortization of actuarial loss  1   ―   1   ―   ―
Net periodic pension costs$ 6 $ ― $ 3 $ 1 $ 1
                
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 2 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  10   1   5   1   1
Amortization of actuarial loss  4   ―   3   1   1
Amortization of prior service credit  (1)   ―   (1)   ―   ―
Net periodic pension costs$ 15 $ 1 $ 8 $ 3 $ 2
                
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  8   1   6   1   2
Amortization of actuarial loss  2   ―   3   1   ―
Amortization of prior service cost  1   ―   ―   ―   ―
Net periodic pension costs$ 12 $ 1 $ 10 $ 3 $ 2
                
Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2
                      
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 5 $ 2 $ 2 $ 1 $ 1
Interest cost on accumulated post-retirement benefit obligation  19   4   11   6   4   1   1
Expected return on plan assets  (4)   (3)   ―   ―   ―   (1)   ―
Amortization of prior service credit  (2)   (2)   ―   ―   ―   ―   ―
Amortization of net transition liability  3   2   1   ―   1   ―   ―
Amortization of actuarial loss (gain)  8   1   10   6   3   (1)   ―
Special termination charge  9   1   5   2   1   ―   ―
Net periodic other post-retirement benefit costs(a)$ 40 $ 4 $ 32 $ 16 $ 11 $ ― $ 2
                      
(a)Duke Energy amounts exclude $2 million and $3 million for the three months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
                      
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 21 $ 2 $ 17 $ 9 $ 6 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  55   9   35   19   13   1   4
Expected return on plan assets  (11)   (7)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (9)   (6)   (1)   (1)   ―   ―   ―
Amortization of actuarial loss (gain)  39   2   42   26   12   (1)   1
Net periodic other post-retirement benefit costs(a)(b)$ 95 $ ― $ 93 $ 53 $ 31 $ ― $ 5
                      
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 10 $ 2 $ 12 $ 6 $ 5 $ 1 $ 1
Interest cost on accumulated post-retirement benefit obligation  36   12   32   17   13   2   5
Expected return on plan assets  (12)   (8)   (1)   ―   (1)   (1)   (1)
Amortization of prior service credit  (6)   (4)   ―   ―   ―   ―   1
Amortization of net transition liability  7   5   3   ―   2   ―   ―
Amortization of actuarial loss (gain)  5   2   25   14   9   (2)   (1)
Special termination charge  9   1   5   2   1   ―   ―
Net periodic other post-retirement benefit costs(a)(b)$ 49 $ 10 $ 76 $ 39 $ 29 $ ― $ 5
                      
(a)Duke Energy amounts exclude $6 million and $7 million for the nine months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
(b)Duke Energy Ohio amounts exclude $1 million for each of the nine months ended September 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
                      
Remeasurement of Accumulated Other Post-retirement Benefit Obligation    
     
(in millions)   
Duke Energy $551
Progress Energy  551
Duke Energy Progress  382
Duke Energy Florida  103
     
  
Duke Energy Carolinas [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs    
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 2 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  10   1   5   1   1
Amortization of actuarial loss  4   ―   3   1   1
Amortization of prior service credit  (1)   ―   (1)   ―   ―
Net periodic pension costs$ 15 $ 1 $ 8 $ 3 $ 2
                
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  8   1   6   1   2
Amortization of actuarial loss  2   ―   3   1   ―
Amortization of prior service cost  1   ―   ―   ―   ―
Net periodic pension costs$ 12 $ 1 $ 10 $ 3 $ 2
                
Duke Energy Carolinas [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs  
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2
                      
    
Progress Energy [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  3   ―   1   ―   ―
Amortization of actuarial loss  1   ―   1   1   1
Net periodic pension costs$ 5 $ ― $ 3 $ 2 $ 1
                
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Interest cost on projected benefit obligation$ 5 $ ― $ 2 $ 1 $ 1
Amortization of actuarial loss  1   ―   1   ―   ―
Net periodic pension costs$ 6 $ ― $ 3 $ 1 $ 1
                
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 2 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  10   1   5   1   1
Amortization of actuarial loss  4   ―   3   1   1
Amortization of prior service credit  (1)   ―   (1)   ―   ―
Net periodic pension costs$ 15 $ 1 $ 8 $ 3 $ 2
                
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  8   1   6   1   2
Amortization of actuarial loss  2   ―   3   1   ―
Amortization of prior service cost  1   ―   ―   ―   ―
Net periodic pension costs$ 12 $ 1 $ 10 $ 3 $ 2
                
Progress Energy [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs  
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2
                      
    
Remeasurement of Accumulated Other Post-retirement Benefit Obligation    
     
(in millions)   
Duke Energy $551
Progress Energy  551
Duke Energy Progress  382
Duke Energy Florida  103
     
  
Duke Energy Progress [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  3   ―   1   ―   ―
Amortization of actuarial loss  1   ―   1   1   1
Net periodic pension costs$ 5 $ ― $ 3 $ 2 $ 1
                
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Interest cost on projected benefit obligation$ 5 $ ― $ 2 $ 1 $ 1
Amortization of actuarial loss  1   ―   1   ―   ―
Net periodic pension costs$ 6 $ ― $ 3 $ 1 $ 1
                
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 2 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  10   1   5   1   1
Amortization of actuarial loss  4   ―   3   1   1
Amortization of prior service credit  (1)   ―   (1)   ―   ―
Net periodic pension costs$ 15 $ 1 $ 8 $ 3 $ 2
                
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  8   1   6   1   2
Amortization of actuarial loss  2   ―   3   1   ―
Amortization of prior service cost  1   ―   ―   ―   ―
Net periodic pension costs$ 12 $ 1 $ 10 $ 3 $ 2
                
Duke Energy Progress [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs  
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2
                      
    
Remeasurement of Accumulated Other Post-retirement Benefit Obligation    
     
(in millions)   
Duke Energy $551
Progress Energy  551
Duke Energy Progress  382
Duke Energy Florida  103
     
  
Duke Energy Florida [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  3   ―   1   ―   ―
Amortization of actuarial loss  1   ―   1   1   1
Net periodic pension costs$ 5 $ ― $ 3 $ 2 $ 1
                
  Three Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Interest cost on projected benefit obligation$ 5 $ ― $ 2 $ 1 $ 1
Amortization of actuarial loss  1   ―   1   ―   ―
Net periodic pension costs$ 6 $ ― $ 3 $ 1 $ 1
                
  Nine Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 2 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  10   1   5   1   1
Amortization of actuarial loss  4   ―   3   1   1
Amortization of prior service credit  (1)   ―   (1)   ―   ―
Net periodic pension costs$ 15 $ 1 $ 8 $ 3 $ 2
                
  Nine Months Ended September 30, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida
Service cost$ 1 $ ― $ 1 $ 1 $ ―
Interest cost on projected benefit obligation  8   1   6   1   2
Amortization of actuarial loss  2   ―   3   1   ―
Amortization of prior service cost  1   ―   ―   ―   ―
Net periodic pension costs$ 12 $ 1 $ 10 $ 3 $ 2
                
Duke Energy Florida [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs  
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2
                      
    
Remeasurement of Accumulated Other Post-retirement Benefit Obligation    
     
(in millions)   
Duke Energy $551
Progress Energy  551
Duke Energy Progress  382
Duke Energy Florida  103
     
  
Duke Energy Indiana [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Components of Net Periodic Pension Costs  
  Three Months Ended September 30, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 1 $ 6 $ 3 $ 2 $ ― $ 1
Interest cost on accumulated post-retirement benefit obligation  19   3   12   7   5   ―   1
Expected return on plan assets  (4)   (2)   ―   ―   ―   ―   (1)
Amortization of prior service credit  (3)   (2)   ―   ―   ―   ―   ―
Amortization of actuarial loss   13   ―   13   8   4   ―   1
Net periodic other post-retirement benefit costs(a)$ 32 $ ― $ 31 $ 18 $ 11 $ ― $ 2