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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Pension Plan Contributions
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Anticipated Contributions:                    
2014$ 143 $ 42 $ 51 $ 21 $ 21 $ 4 $ 9
Contributions Made:                    
2013$ 250 $ — $ 250 $ 63 $ 133 $ — $ —
2012  304   —   346   141   128   —   —
2011  200   33   334   217   112   48   52
                      
    
Employee Savings Plan Matching Contributions
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Years ended December 31,                    
 2013$ 134 $ 45 $ 45 $ 25 $ 14 $ 3 $ 7
 2012  107   37   45   24   15   4   6
 2011  86   37   44   23   14   4   8
                      
    
Qualified Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of Net Periodic Pension Costs
Components of Net Periodic Pension Costs
                      
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 167 $ 49 $ 60 $ 22 $ 30 $ 6 $ 11
Interest cost on projected benefit obligation  320   80   116   50   53   21   28
Expected return on plan assets  (549)   (148)   (199)   (94)   (87)   (31)   (46)
Amortization of actuarial loss  244   60   101   46   49   13   24
Amortization of prior service (credit) cost   (11)   (6)   (4)   (1)   (2)   ―   1
Other  7   2   2   1   1   ―   1
Net periodic pension costs(a)(b)$ 178 $ 37 $ 76 $ 24 $ 44 $ 9 $ 19
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 122 $ 35 $ 63 $ 25 $ 30 $ 6 $ 9
Interest cost on projected benefit obligation  307   90   127   58   56   31   30
Expected return on plan assets  (472)   (146)   (188)   (96)   (81)   (45)   (46)
Amortization of actuarial loss  144   45   93   37   48   10   15
Amortization of prior service cost (credit)  10   1   9   8   (1)   1   1
Other  6   2   2   1   1   ―   ―
Net periodic pension costs(a)(b)$ 117 $ 27 $ 106 $ 33 $ 53 $ 3 $ 9
                      
  Year Ended December 31, 2011
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 96 $ 37 $ 51 $ 20 $ 24 $ 7 $ 11
Interest cost on projected benefit obligation  232   85   132   61   57   32   30
Expected return on plan assets  (384)   (150)   (182)   (91)   (78)   (44)   (45)
Amortization of actuarial loss  77   37   66   25   33   7   14
Amortization of prior service cost  6   1   7   6   ―   1   2
Other  18   7   ―   ―   ―   2   2
Net periodic pension costs(a)(b)$ 45 $ 17 $ 74 $ 21 $ 36 $ 5 $ 14
                      
Amounts Recognized in AOCI and Regulatory Assets and Liabilities
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net decrease$ (788) $ (205) $ (253) $ (109) $ (146) $ (96) $ (99)
Accumulated other comprehensive (income) loss                    
Deferred income tax benefit$ 18 $ ― $ ― $ ― $ ― $ ― $ ―
Actuarial gains arising during the year  (33)   ―   (2)   ―   ―   ―   ―
Prior year service credit arising during the year  (1)   ―   ―   ―   ―   ―   ―
Amortization of prior year actuarial losses  (15)   ―   (3)   ―   ―   ―   ―
Reclassification of actuarial losses to regulatory assets  3   ―   ―   ―   ―   ―   ―
Net amount recognized in accumulated other comprehensive income$ (28) $ ― $ (5) $ ― $ ― $ ― $ ―
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net increase (decrease)$ 976 $ (111) $ (76) $ (89) $ 23 $ 22 $ 17
Accumulated other comprehensive (income) loss                    
Deferred income tax benefit $ 14 $ ― $ ― $ ― $ ― $ 15 $ ―
Reclassification of actuarial losses to an affiliate  ―   ―   ―   ―   ―   (48)   ―
Actuarial (gains) losses arising during the year  (2)   ―   3   ―   ―   ―   ―
Prior year service credit arising during the year  (7)   ―   ―   ―   ―   ―   ―
Amortization of prior year actuarial losses  (13)   ―   (2)   ―   ―   (3)   ―
Reclassification of actuarial losses to regulatory assets  (20)   ―   ―   ―   ―   (1)   ―
Amortization of prior year service cost  (1)   ―   (1)   ―   ―   (1)   ―
Net amount recognized in accumulated other comprehensive income$ (29) $ ― $ ― $ ― $ ― $ (38) $ ―
                      
  
Reconciliation of Funded Status to Net Amount Recognized
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Obligation at prior measurement date$ 8,030 $ 2,028 $ 2,868 $ 1,264 $ 1,309 $ 527 $ 684
Service cost  167   49   60   22   30   6   11
Interest cost  320   80   116   50   53   21   28
Actuarial gains  (399)   (73)   (118)   (26)   (75)   (71)   (56)
Transfers  ―   (26)   (7)   (45)   (17)   (2)   (2)
Plan amendments  (41)   (13)   (19)   (8)   (7)   ―   ―
Benefits paid  (567)   (170)   (161)   (85)   (60)   (39)   (33)
Obligation at measurement date$ 7,510 $ 1,875 $ 2,739 $ 1,172 $ 1,233 $ 442 $ 632
Accumulated Benefit Obligation at measurement date$ 7,361 $ 1,875 $ 2,698 $ 1,172 $ 1,192 $ 429 $ 608
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ 7,754 $ 2,151 $ 2,647 $ 1,289 $ 1,150 $ 446 $ 627
Actual return on plan assets  705   207   215   108   93   43   62
Benefits paid  (567)   (170)   (161)   (85)   (60)   (39)   (33)
Transfers  ―   (26)   (7)   (45)   (17)   (2)   (2)
Employer contributions  250   ―   250   63   133   ―   ―
Plan assets at measurement date$ 8,142 $ 2,162 $ 2,944 $ 1,330 $ 1,299 $ 448 $ 654
Funded status of plan$ 632 $ 287 $ 205 $ 158 $ 66 $ 6 $ 22
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Obligation at prior measurement date$ 4,880 $ 1,831 $ 2,729 $ 1,263 $ 1,179 $ 627 $ 613
Obligation assumed from acquisition  2,850   ―   ―   ―   ―   ―   ―
Service cost  122   35   63   25   30   6   9
Interest cost  307   90   127   58   56   31   30
Actuarial losses  489   73   166   34   120   68   76
Transfers  ―   176   ―   ―   ―   (167)   ―
Plan amendments  (170)   (52)   (64)   (43)   (10)   ―   (1)
Benefits paid  (448)   (125)   (153)   (73)   (66)   (38)   (43)
Obligation at measurement date$ 8,030 $ 2,028 $ 2,868 $ 1,264 $ 1,309 $ 527 $ 684
Accumulated Benefit Obligation at measurement date$ 7,843 $ 2,028 $ 2,820 $ 1,264 $ 1,261 $ 501 $ 653
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ 4,741 $ 1,820 $ 2,191 $ 1,091 $ 969 $ 565 $ 582
Assets received from acquisition  2,285   ―   ―   ―   ―   ―   ―
Actual return on plan assets  872   280   263   130   119   86   88
Benefits paid  (448)   (125)   (153)   (73)   (66)   (38)   (43)
Transfers  ―   176   ―   ―   ―   (167)   ―
Employer contributions  304   ―   346   141   128   ―   ―
Plan assets at measurement date$ 7,754 $ 2,151 $ 2,647 $ 1,289 $ 1,150 $ 446 $ 627
Funded status of plan$ (276) $ 123 $ (221) $ 25 $ (159) $ (81) $ (57)
                      
  
Amounts Recognized in the Consolidated Balance Sheet
  December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Prefunded pension(a)$ 632 $ 287 $ 230 $ 158 $ 66 $ 2 $ 75
Noncurrent pension liability$ ― $ ― $ 25 $ ― $ ― $ (4) $ 53
Net asset recognized$ 632 $ 287 $ 205 $ 158 $ 66 $ 6 $ 22
Regulatory assets$ 1,599 $ 377 $ 826 $ 363 $ 395 $ 48 $ 147
Accumulated other comprehensive (income) loss                    
Deferred income tax asset$ (41) $ ― $ (9) $ ― $ ― $ ― $ ―
Prior service credit  (5)   ―   ―   ―   ―   ―   ―
Net actuarial loss  121   ―   21   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive loss(b)$ 75 $ ― $ 12 $ ― $ ― $ ― $ ―
Amounts to be recognized in net periodic pension expense in the next year                    
Unrecognized net actuarial loss$ 149 $ 35 $ 71 $ 33 $ 32 $ 4 $ 7
Unrecognized prior service credit  (15)   (8)   (4)   (2)   (1)   ―   ―
                      
  December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Prefunded pension(a)$ 163 $ 123 $ ― $ 25 $ ― $ ― $ ―
Noncurrent pension liability$ 439 $ ― $ 221 $ ― $ 159 $ 81 $ 57
Net asset (liability) recognized$ (276) $ 123 $ (221) $ 25 $ (159) $ (81) $ (57)
Regulatory assets$ 2,387 $ 582 $ 1,079 $ 472 $ 541 $ 144 $ 246
Accumulated other comprehensive (income) loss                    
Deferred income tax asset$ (59) $ ― $ (9) $ ― $ ― $ ― $ ―
Prior service credit  (4)   ―   ―   ―   ―   ―   ―
Net actuarial loss  166   ―   26   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive loss(b)$ 103 $ ― $ 17 $ ― $ ― $ ― $ ―
                      
  
Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets
Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets
                
As of December 31, 2013, no qualified pension plans had an accumulated benefit obligation in excess of plan assets.
                
  December 31, 2012
(in millions)Duke Energy Progress Energy Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Projected benefit obligation$ 5,396 $ 2,868 $ 1,309 $ 527 $ 684
Accumulated benefit obligation  5,201   2,820   1,261   501   653
Fair value of plan assets  4,957   2,647   1,150   446   627
                
    
Assumptions Used for Pension Benefits Accounting
                   
  Duke Energy Progress Energy
  December 31, December 31,
 2013 2012 2011 2013 2012 2011
Benefit Obligations                 
Discount rate 4.70%  4.10%  5.10%  4.70%  4.10%  4.75%
Salary increase 4.40%  4.30%  4.40%  4.00%  4.00%  4.00%
Net Periodic Benefit Cost                 
Discount rate 4.10% 4.60-5.10%  5.00%  4.10% 4.60-4.75%  5.55%
Salary increase 4.30% 4.40%  4.10%  4.00% 4.00%  4.50%
Expected long-term rate of return on plan assets 7.75% 8.00%  8.25%  7.75% 8.00-8.25%  8.50%
                   
    
Expected Benefit Payments
Expected Benefit Payments
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Years ending December 31,                    
2014$ 667 $ 224 $ 190 $ 98 $ 68 $ 36 $ 47
2015  643   218   185   92   71   35   45
2016  640   212   190   93   74   34   46
2017  633   205   191   91   77   34   44
2018  623   196   194   91   80   34   46
2019 - 2023  2,933   807   969   422   430   171   227
                      
    
Non-Qualified Pension Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of Net Periodic Pension Costs
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 3 $ ― $ 1 $ 1 $ ― $ ― $ ―
Interest cost on projected benefit obligation  13   1   7   1   1   ―   ―
Amortization of actuarial loss  5   ―   3   1   1   ―   ―
Amortization of prior service credit  (1)   ―   (1)   ―   ―   ―   ―
Net periodic pension costs$ 20 $ 1 $ 10 $ 3 $ 2 $ ― $ ―
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 2 $ ― $ 2 $ 1 $ ― $ ― $ ―
Interest cost on projected benefit obligation  12   1   8   1   2   ―   ―
Amortization of actuarial loss  4   ―   5   1   ―   ―   ―
Amortization of prior service cost (credit)  1   ―   (1)   ―   ―   ―   ―
Net periodic pension costs$ 19 $ 1 $ 14 $ 3 $ 2 $ ― $ ―
                      
  Year Ended December 31, 2011
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 1 $ ― $ 2 $ 1 $ ― $ ― $ ―
Interest cost on projected benefit obligation  8   1   9   2   2   ―   ―
Amortization of actuarial loss  ―   ―   3   ―   1   ―   ―
Amortization of prior service cost  2   ―   ―   ―   ―   ―   ―
Net periodic pension costs$ 11 $ 1 $ 14 $ 3 $ 3 $ ― $ ―
                      
Amounts Recognized in AOCI and Regulatory Assets and Liabilities
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net (decrease) increase $ (14) $ 1 $ (16) $ (4) $ (3) $ ― $ (2)
Regulatory liabilities, net increase$ 5 $ ― $ ― $ ― $ ― $ ― $ ―
Accumulated other comprehensive (income) loss                    
Deferred income tax benefit $ ― $ ― $ 1 $ ― $ ― $ ― $ ―
Actuarial losses (gains) arising during the year  2   ―   (5)   ―   ―   ―   ―
Prior year service credit arising during the year  (1)   ―   ―   ―   ―   ―   ―
Net amount recognized in accumulated other comprehensive loss (income) $ 1 $ ― $ (4) $ ― $ ― $ ― $ ―
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net increase (decrease)$ 34 $ ― $ (6) $ (2) $ 1 $ ― $ ―
Regulatory liabilities, net increase$ (8) $ ― $ ― $ ― $ ― $ ― $ ―
Accumulated other comprehensive (income) loss                    
Deferred income tax benefit $ ― $ ― $ (1) $ ― $ ― $ ― $ ―
Actuarial (gains) losses arising during the year  (2)   ―   3   ―   ―   ―   ―
Net amount recognized in accumulated other comprehensive (income) loss$ (2) $ ― $ 2 $ ― $ ― $ ― $ ―
                      
  
Reconciliation of Funded Status to Net Amount Recognized
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Obligation at prior measurement date$ 335 $ 16 $ 176 $ 38 $ 45 $ 4 $ 5
Service cost  3   ―   1   1   ―   ―   ―
Interest cost  13   1   7   1   1   ―   ―
Actuarial losses  (15)   1   (11)   (3)   (3)   (1)   ―
Settlements  (5)   ―   ―   ―   ―   ―   ―
Plan amendments  (1)   ―   ―   ―   ―   ―   ―
Transfers  ―   ―   (21)   ―   ―   ―   ―
Benefits paid  (26)   (3)   (12)   (3)   (4)   ―   ―
Obligation at measurement date$ 304 $ 15 $ 140 $ 34 $ 39 $ 3 $ 5
Accumulated Benefit Obligation at measurement date$ 302 $ 15 $ 140 $ 34 $ 39 $ 3 $ 5
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ ― $ ― $ ― $ ― $ ― $ ― $ ―
Benefits paid  (26)   (3)   (12)   (3)   (4)   ―   ―
Employer contributions  26   3   12   3   4   ―   ―
Plan assets at measurement date$ ― $ ― $ ― $ ― $ ― $ ― $ ―
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Obligation at prior measurement date$ 160 $ 18 $ 177 $ 39 $ 44 $ 4 $ 5
Obligation assumed from acquisition  172   ―   ―   ―   ―   ―   ―
Service cost  2   ―   2   1   ―   ―   ―
Interest cost  12   1   8   1   2   ―   ―
Actuarial losses  18   ―   11   3   3   ―   ―
Plan amendments  (5)   ―   (12)   (4)   (2)   ―   ―
Transfers  ―   1   ―   ―   ―   ―   ―
Benefits paid  (24)   (4)   (10)   (2)   (2)   ―   ―
Obligation at measurement date$ 335 $ 16 $ 176 $ 38 $ 45 $ 4 $ 5
Accumulated Benefit Obligation at measurement date$ 332 $ 16 $ 175 $ 36 $ 44 $ 4 $ 5
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ ― $ ― $ ― $ ― $ ― $ ― $ ―
Benefits paid  (24)   (4)   (10)   (2)   (3)   ―   ―
Employer contributions  24   4   10   2   3   ―   ―
Plan assets at measurement date$ ― $ ― $ ― $ ― $ ― $ ― $ ―
                      
  
Amounts Recognized in the Consolidated Balance Sheet
  December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Current pension liability(a)$ 30 $ 2 $ 11 $ 2 $ 3 $ ― $ ―
Noncurrent pension liability  274   13   129   32   36   3   5
Total accrued pension liability$ 304 $ 15 $ 140 $ 34 $ 39 $ 3 $ 5
Regulatory assets$ 45 $ 4 $ 18 $ 3 $ 6 $ ― $ ―
Regulatory liabilities$ 7 $ ― $ ― $ ― $ ― $ ― $ ―
Accumulated other comprehensive (income) loss                    
Deferred income tax asset$ ― $ ― $ (3) $ ― $ ― $ ― $ ―
Prior service credit  (1)   ―   ―   ―   ―   ―   ―
Net actuarial loss  1   ―   7   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive loss$ ― $ ― $ 4 $ ― $ ― $ ― $ ―
Amounts to be recognized in net periodic pension expense in the next year                    
Unrecognized net actuarial loss$ 5 $ ― $ 2 $ 1 $ ― $ ― $ ―
Unrecognized prior service credit  (1)   ―   (1)   (1)   ―   ―   ―
                      
  December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Current pension liability(a)$ 30 $ 3 $ 11 $ 2 $ 3 $ ― $ ―
Noncurrent pension liability  305   13   165   36   42   4   5
Total accrued pension liability$ 335 $ 16 $ 176 $ 38 $ 45 $ 4 $ 5
Regulatory assets$ 59 $ 3 $ 34 $ 7 $ 9 $ ― $ 2
Regulatory liabilities$ 2 $ ― $ ― $ ― $ ― $ ― $ ―
Accumulated other comprehensive (income) loss                    
Deferred income tax asset$ ― $ ― $ (4) $ ― $ ― $ ― $ ―
Net actuarial (gain) loss  (1)   ―   12   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive (income) loss$ (1) $ ― $ 8 $ ― $ ― $ ― $ ―
                      
  
Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets
  December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Projected benefit obligation$ 304 $ 15 $ 140 $ 34 $ 39 $ 3 $ 5
Accumulated benefit obligation  302   15   140   34   39   3   5
                      
  December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Projected benefit obligation$ 335 $ 16 $ 176 $ 38 $ 45 $ 4 $ 5
Accumulated benefit obligation  332   16   175   36   44   4   5
                      
  
Assumptions Used for Pension Benefits Accounting
                   
  Duke Energy Progress Energy
  December 31, December 31,
 2013 2012 2011 2013 2012 2011
Benefit Obligations                 
Discount rate 4.70%  4.10%  5.10%  4.70%  4.10%  4.80%
Salary increase 4.40%  4.30%  4.40%  ―%  ―%  5.25%
Net Periodic Benefit Cost                 
Discount rate 4.10% 4.60-5.10%  5.00%  4.10% 4.60-4.80%  5.60%
Salary increase 4.30%  4.40%  4.10%  ―%  ―%  5.25%
                   
    
Expected Benefit Payments
Expected Benefit Payments
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Years ending December 31,                    
2014$ 31 $ 3 $ 11 $ 2 $ 3 $ ― $ ―
2015  28   2   11   2   3   ―   ―
2016  26   2   11   2   3   ―   ―
2017  27   2   11   2   3   ―   ―
2018  24   2   11   2   3   ―   ―
2019 - 2023  112   6   52   13   15   1   2
                      
    
Other Post-Retirement Benefit Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Components of Net Periodic Pension Costs
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 24 $ 2 $ 18 $ 9 $ 7 $ 1 $ 1
Interest cost on accumulated post-retirement benefit obligation  68   13   41   22   16   2   5
Expected return on plan assets  (14)   (11)   ―   ―   ―   (1)   (1)
Amortization of actuarial loss (gain)  52   3   57   34   16   (1)   1
Amortization of prior service credit  (41)   (7)   (30)   (20)   (6)   (1)   ―
Net periodic post-retirement benefit costs(a)(b)$ 89 $ ― $ 86 $ 45 $ 33 $ ― $ 6
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 16 $ 2 $ 17 $ 8 $ 7 $ 1 $ 1
Interest cost on accumulated post-retirement benefit obligation  56   15   43   23   18   3   6
Expected return on plan assets  (17)   (10)   (2)   ―   (2)   (1)   (1)
Amortization of actuarial loss (gain)  14   3   35   20   12   (2)   ―
Amortization of prior service credit  (8)   (5)   ―   ―   ―   (1)   ―
Amortization of net transition liability  10   7   4   ―   3   ―   ―
Special termination benefit cost  9   1   5   2   1   ―   ―
Net periodic post-retirement benefit costs(a)(b)$ 80 $ 13 $ 102 $ 53 $ 39 $ ― $ 6
                      
  Year Ended December 31, 2011
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Service cost$ 7 $ 2 $ 11 $ 5 $ 5 $ 1 $ 1
Interest cost on accumulated post-retirement benefit obligation  35   16   41   20   18   3   7
Expected return on plan assets  (15)   (10)   (2)   ―   (2)   (1)   (1)
Amortization of actuarial (gain) loss  (3)   2   12   5   7   (2)   2
Amortization of prior service credit  (8)   (5)   ―   ―   ―   (1)   ―
Amortization of net transition liability  10   9   5   1   4   ―   ―
Net periodic post-retirement benefit costs(a)(b)$ 26 $ 14 $ 67 $ 31 $ 32 $ ― $ 9
                      
Amounts Recognized in AOCI and Regulatory Assets and Liabilities
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net (decrease) increase $ (683) $ (51) $ (634) $ (388) $ (166) $ ― $ (6)
Regulatory liabilities, net increase (decrease)$ 30 $ ― $ ― $ ― $ ― $ 3 $ 9
Accumulated other comprehensive (income) loss                    
Deferred income tax benefit $ 2 $ ― $ ― $ ― $ ― $ ― $ ―
Actuarial gains arising during the year  (4)   ―   ―   ―   ―   ―   ―
Prior year service credit arising during the year  (3)   ―   ―   ―   ―   ―   ―
Amortization of prior year actuarial loss  1   ―   ―   ―   ―   ―   ―
Net amount recognized in accumulated other comprehensive income$ (4) $ ― $ ― $ ― $ ― $ ― $ ―
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory assets, net increase (decrease)$ 484 $ (20) $ 228 $ 170 $ 28 $ ― $ (6)
Regulatory liabilities, net decrease$ (6) $ ― $ ― $ ― $ ― $ (1) $ (2)
Accumulated other comprehensive (income) loss                    
Deferred income tax expense$ (2) $ ― $ ― $ ― $ ― $ (4) $ ―
Reclassification of actuarial losses to an affiliate  ―   ―   ―   ―   ―   6   ―
Actuarial losses arising during the year  ―   ―   ―   ―   ―   2   ―
Prior year service cost arising during the year  ―   ―   ―   ―   ―   1   ―
Amortization of prior year actuarial loss  ―   ―   ―   ―   ―   1   ―
Reclassification of actuarial gains to regulatory liabilities  4   ―   ―   ―   ―   ―   ―
Net amount recognized in accumulated other comprehensive loss$ 2 $ ― $ ― $ ― $ ― $ 6 $ ―
                      
  
Reconciliation of Funded Status to Net Amount Recognized
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Accumulated post-retirement benefit obligation at prior measurement date$ 1,794 $ 316 $ 1,128 $ 612 $ 413 $ 48 $ 136
Service cost  24   2   18   9   7   1   1
Interest cost  68   13   41   22   16   2   5
Plan participants' contributions  47   15   14   6   7   3   3
Actuarial gains  (227)   (32)   (156)   (73)   (70)   (6)   (12)
Transfers  ―   ―   (1)   (8)   ―   ―   ―
Benefits paid  (132)   (36)   (60)   (26)   (31)   (6)   (14)
Plan amendments  (476)   (16)   (455)   (311)   (91)   ―   (3)
Accrued retiree drug subsidy  8   3   4   2   2   ―   2
Accumulated post-retirement benefit obligation at measurement date$ 1,106 $ 265 $ 533 $ 233 $ 253 $ 42 $ 118
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ 198 $ 134 $ ― $ ― $ ― $ 7 $ 17
Actual return on plan assets  18   13   ―   ―   ―   2   2
Benefits paid  (132)   (36)   (60)   (26)   (31)   (6)   (14)
Transfers(a)  ―   (1)   ―   ―   ―   ―   ―
Employer contributions  83   18   46   20   24   2   10
Plan participants' contributions  47   15   14   6   7   3   3
Plan assets at measurement date$ 214 $ 143 $ ― $ ― $ ― $ 8 $ 18
                      
  Year Ended December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Change in Projected Benefit Obligation                    
Accumulated post-retirement benefit obligation at prior measurement date$ 667 $ 312 $ 841 $ 407 $ 368 $ 61 $ 135
Obligation assumed from acquisition  977   ―   ―   ―   ―   ―   ―
Service cost  16   2   17   8   7   1   1
Interest cost  56   15   43   23   18   3   6
Plan participants' contributions  41   18   13   5   7   4   8
Actuarial gains  198   28   291   205   49   3   (2)
Transfers  ―   9   ―   ―   ―   (16)   ―
Benefits paid  (105)   (38)   (61)   (24)   (33)   (8)   (13)
Special termination benefit cost  9   1   5   2   1   ―   ―
Plan amendments  (70)   (33)   (25)   (16)   (6)   ―   ―
Accrued retiree drug subsidy  5   2   4   2   2   ―   1
Accumulated post-retirement benefit obligation at measurement date$ 1,794 $ 316 $ 1,128 $ 612 $ 413 $ 48 $ 136
Change in Fair Value of Plan Assets                    
Plan assets at prior measurement date$ 181 $ 120 $ 37 $ ― $ 37 $ 9 $ 14
Actual return on plan assets  23   12   2   ―   2   1   2
Benefits paid  (105)   (38)   (61)   (24)   (33)   (8)   (13)
Transfers(a)  ―   5   (39)   ―   (39)   (3)   ―
Employer contributions  58   17   48   19   26   4   6
Plan participants' contributions  41   18   13   5   7   4   8
Plan assets at measurement date$ 198 $ 134 $ ― $ ― $ ― $ 7 $ 17
                      
(a)Progress Energy and Duke Energy Florida amounts reflect assets that did not meet the definition of plan assets. These assets are included in Other within Investments and Other Assets on the Consolidated Balance Sheets.
                      
  
Amounts Recognized in the Consolidated Balance Sheet
  December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Current post-retirement liability(a)$ 39 $ ― $ 36 $ 17 $ 16 $ 2 $ ―
Noncurrent post-retirement liability  853   122   497   216   237   32   100
Total accrued post-retirement liability$ 892 $ 122 $ 533 $ 233 $ 253 $ 34 $ 100
Regulatory assets$ (162) $ (34) $ (129) $ (97) $ 4 $ ― $ 71
Regulatory liabilities$ 131 $ ― $ ― $ ― $ ― $ 21 $ 77
Accumulated other comprehensive (income) loss                    
Deferred income tax liability$ 4 $ ― $ ― $ ― $ ― $ ― $ ―
Prior service credit  (5)   ―   ―   ―   ―   ―   ―
Net actuarial gain  (6)   ―   ―   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive income$ (7) $ ― $ ― $ ― $ ― $ ― $ ―
Amounts to be recognized in net periodic pension expense in the next year                    
Unrecognized net actuarial loss (gain)$ 38 $ 3 $ 46   30 $ 10 $ (2) $ (6)
Unrecognized prior service credit  (125)   (10)   (112)   (73)   (21)   ―   ―
                      
  December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Current post-retirement liability(a)$ 50 $ ― $ 47 $ 23 $ 20 $ 2 $ ―
Noncurrent post-retirement liability  1,546   182   1,081   589   393   39   119
Total accrued post-retirement liability$ 1,596 $ 182 $ 1,128 $ 612 $ 413 $ 41 $ 119
Regulatory assets$ 521 $ 17 $ 505 $ 291 $ 170 $ ― $ 77
Regulatory liabilities$ 101 $ ― $ ― $ ― $ ― $ 18 $ 68
Accumulated other comprehensive (income) loss                    
Deferred income tax liability$ 2 $ ― $ ― $ ― $ ― $ ― $ ―
Prior service credit  (3)   ―   ―   ―   ―   ―   ―
Net actuarial gain  (2)   ―   ―   ―   ―   ―   ―
Net amounts recognized in accumulated other comprehensive income$ (3) $ ― $ ― $ ― $ ― $ ― $ ―
                      
  
Assumptions Used for Pension Benefits Accounting
                   
  Duke Energy Progress Energy
  December 31, December 31,
 2013 2012 2011 2013 2012 2011
Benefit Obligations                 
Discount rate 4.70%  4.10%  5.10%  4.70%  4.10%  4.85%
Net Periodic Benefit Cost                 
Discount rate 4.10% 4.60-5.10%  5.00%  4.10% 4.60-4.85%  5.70%
Expected long-term rate of return on plan assets 7.75% 5.20-8.00% 5.36-8.25%  ―% N/A-5.00%  5.00%
Assumed tax rate 35%  35%  35%         
                   
    
Assumed Health Care Cost Trend Rate
Assumed Health Care Cost Trend Rate     
       
  December 31,
 2013 2012
Health care cost trend rate assumed for next year 8.50%  8.50%
Rate to which the cost trend is assumed to decline (the ultimate trend rate) 5.00%  5.00%
Year that rate reaches ultimate trend2021  2020 
       
    
Sensitivity to Changes in Assumed Health Care Cost Trend Rates
Sensitivity to Changes in Assumed Health Care Cost Trend Rates
                      
  Year Ended December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
1-Percentage Point Increase                    
Effect on total service and interest costs$ 11 $ 2 $ 7 $ 4 $ 3 $ 1 $ 1
Effect on post-retirement benefit obligation  42   10   20   9   10   2   4
1-Percentage Point Decrease                    
Effect on total service and interest costs  (9)   (1)   (6)   (3)   (2)   —   (1)
Effect on post-retirement benefit obligation  (36)   (9)   (16)   (7)   (8)   (1)   (4)
                      
    
Expected Benefit Payments
Expected Benefit Payments
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Years ending December 31,                    
 2014$85 $21 $36 $17 $17 $4 $11
 2015 88  22  38  17  17  4  12
 2016 89  23  38  18  17  4  12
 2017 89  23  38  18  17  3  11
 2018 89  24  38  18  17  3  11
 2019 - 2023 413  109  180  81  84  17  47
                      
    
Master Trust [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value and Allocation of Plan Assets
           
      Actual Allocation at December 31,
 Target Allocation 2013 2012
U.S. equity securities  10%  10%  28%
Non-U.S. equity securities  8%  8%  15%
Global equity securities  10%  10%  10%
Global private equity securities  3%  3%  3%
Debt securities  63%  63%  32%
Hedge funds  2%  3%  4%
Real estate and cash  2%  1%  4%
Other global securities  2%  2%  4%
Total 100%  100%  100%
           

Duke Energy Master Retirement Trust           
             
The following tables provide the fair value measurement amounts for the Duke Energy Master Retirement Trust qualified pension and other post-retirement assets.
             
  December 31, 2013
(in millions)Total Fair Value Level 1 Level 2 Level 3
Equity securities$ 2,877 $ 1,801 $ 1,022 $ 54
Corporate debt securities  2,604   ―   2,601   3
Short-term investment funds  1,158   254   904   ―
Partnership interests  307   ―   ―   307
Hedge funds  164   ―   111   53
Real estate trusts  95   ―   ―   95
U.S. government securities  927   ―   927   ―
Guaranteed investment contracts  33   ―   ―   33
Governments bonds - foreign  19   ―   18   1
Cash  58   58   ―   ―
Government and commercial mortgage backed securities  7   ―   7   ―
Net pending transactions and other investments  12   7   5   ―
Total assets(a) $ 8,261 $ 2,120 $ 5,595 $ 546
             
(a)Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio and Duke Energy Indiana were allocated approximately 28 percent, 35 percent, 16 percent, 16 percent, 5 percent and 8 percent, respectively, of the Duke Energy Master Retirement Trust assets at December 31, 2013. Accordingly, all Level 1, 2 and 3 amounts included in the table above are allocable to the Subsidiary Registrants using these percentages.
             
  December 31, 2012
(in millions)Total Fair Value Level 1 Level 2 Level 3
Equity securities$ 2,993 $ 1,415 $ 1,575 $ 3
Corporate debt securities  1,391   ―   1,388   3
Short-term investment funds  100   23   77   ―
Partnership interests  141   ―   ―   141
Hedge funds  97   ―   97   ―
Real estate trusts  167   ―   ―   167
U.S. government securities  237   ―   237   ―
Guarantees investment contracts  37   ―   ―   37
Governments bonds - foreign  65   ―   64   1
Cash  4   4   ―   ―
Asset backed securities  14   ―   14   ―
Net pending transactions and other investments  (16)   (21)   5   ―
Total assets(a) $ 5,230 $ 1,421 $ 3,457 $ 352
             
(a) Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana were allocated approximately 43 percent, 9 percent and 12 percent, respectively, of the Duke Energy Master Retirement Trust assets at December 31, 2012. Accordingly, all Level 1, 2 and 3 amounts included in the table above are allocable to Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana using these percentages.
             
  
Master Trust Level 3 Rollforward
The following tables provide a reconciliation of beginning and ending balances of assets of master trusts measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3).
       
(in millions)2013 2012
Balance at January 1$ 352 $ 322
Combination of trust assets  288   ―
Purchases, sales, issuances and settlements     
Purchases  25   21
Sales  (152)   (4)
Total gains (losses) and other  33   13
Balance at December 31$ 546 $ 352
       
    
Voluntary Employee Beneficiary Association [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value and Allocation of Plan Assets
           
      Actual Allocation at December 31,
 Target Allocation 2013 2012
U.S. equity securities  30%  29%  23%
Debt securities  45%  29%  32%
Cash  25%  42%  45%
Total  100%  100%  100%
           

  December 31, 2013
(in millions)Total Fair Value Level 1 Level 2 Level 3
Cash and cash equivalents$ 21 $ ― $ 21 $ ―
Equity securities  15   ―   15   ―
Debt securities  15   ―   15   ―
Total assets$ 51 $ ― $ 51 $ ―
             
  December 31, 2012
(in millions)Total Fair Value Level 1 Level 2 Level 3
Cash and cash equivalents$ 22 $ ― $ 22 $ ―
Equity securities  12   ―   12   ―
Debt securities  16   ―   16   ―
Total assets$ 50 $ ― $ 50 $ ―
             
  
Progress Energy [Member] | Master Trust [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value and Allocation of Plan Assets  
     
   Actual Allocation at December 31,
  2012
U.S. equity securities  20%
Non-U.S. equity securities  14%
Global equity securities  8%
Global private equity securities  10%
Debt securities  35%
Hedge funds  9%
Real estate and cash  1%
Other global securities  3%
Total  100%
     

Progress Energy Master Retirement Trust
             
The following table provides the fair value measurement amounts for the Progress Energy Master Retirement Trust qualified pension assets.
             
  December 31, 2012
(in millions)Total Fair Value Level 1 Level 2 Level 3
Equity securities$ 1,094 $ 361 $ 733 $ ―
Corporate debt securities  432   ―   432   ―
Partnership interests  154   ―   ―   154
Hedge funds  313   ―   189   124
U.S. government securities  515   405   110   ―
Governments bonds - foreign  6   ―   6   ―
Cash  160   113   47   ―
Net pending transactions and other investments  16   ―   6   10
Total assets(a)$ 2,690 $ 879 $ 1,523 $ 288
             
(a)Duke Energy Progress and Duke Energy Florida were allocated approximately 48 percent and 44 percent, respectively, of the Progress Energy Master Trust assets at December 31, 2012. Accordingly, all Level 1, 2 and 3 amounts included in the table above are allocable to Duke Energy Progress and Duke Energy Florida using these percentages.
             
  
Master Trust Level 3 Rollforward
The following tables provide a reconciliation of beginning and ending balances of Progress Trust assets measured at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3).
       
(in millions)2013 2012
Balance at January 1$ 288 $ 311
Combination of trust assets  (288)   ―
Purchases, sales, issuances and settlements     
Purchases  ―   13
Sales  ―   (14)
Transfers in and/or out of level 3  ―   (41)
Total gains (losses) and other  ―   19
Balance at December 31$ ― $ 288