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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost $ 42 $ 22 $ 84 $ 45
Interest cost on benefit obligation 80 59 160 120
Expected return on plan assets (137) (94) (274) (188)
Amortization of prior service cost (credit) (3) 2 (6) 3
Amortization of actuarial loss (gain) 61 25 122 49
Other 1 1 3 2
Net periodic costs 44 [1] 15 [1] 89 [2] 31 [2]
Regulatory asset amortization 3 4 6 7
Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 1   1 1
Interest cost on benefit obligation 3 1 7 3
Amortization of prior service cost (credit)   1 (1) 1
Amortization of actuarial loss (gain) 1 1 3 1
Net periodic costs 5 3 10 6
Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 7 1 14 3
Interest cost on benefit obligation 18 9 36 17
Expected return on plan assets (4) (4) (7) (8)
Amortization of prior service cost (credit) (3) (2) (6) (4)
Amortization of net transition liability   2   4
Amortization of actuarial loss (gain) 13 (1) 26 (3)
Net periodic costs 31 [3] 5 [3] 63 [4] 9 [4]
Regulatory asset amortization 2 2 4 4
Duke Energy Carolinas [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 13 8 25 17
Interest cost on benefit obligation 20 22 40 45
Expected return on plan assets (37) (37) (74) (73)
Amortization of prior service cost (credit) (1) 1 (3) 1
Amortization of actuarial loss (gain) 15 12 30 23
Other 0 1 1 1
Net periodic costs 10 7 19 14
Duke Energy Carolinas [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest cost on benefit obligation 1 1 1 1
Net periodic costs 1 1 1 1
Duke Energy Carolinas [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 0 0 1 1
Interest cost on benefit obligation 3 4 6 8
Expected return on plan assets (2) (2) (5) (5)
Amortization of prior service cost (credit) (2) (1) (4) (2)
Amortization of net transition liability   2   3
Amortization of actuarial loss (gain) 1 0 2 1
Net periodic costs 0 3 0 6
Progress Energy [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 15 16 30 31
Interest cost on benefit obligation 29 32 58 63
Expected return on plan assets (49) (47) (99) (93)
Amortization of prior service cost (credit) (1) 2 (2) 4
Amortization of actuarial loss (gain) 25 24 50 46
Other 0 0 1  
Net periodic costs 19 27 38 51
Progress Energy [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost       1
Interest cost on benefit obligation 2 2 4 4
Amortization of prior service cost (credit) 0   (1)  
Amortization of actuarial loss (gain) 1 1 2 2
Net periodic costs 3 3 5 7
Progress Energy [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 5 4 11 7
Interest cost on benefit obligation 12 11 23 21
Expected return on plan assets       (1)
Amortization of prior service cost (credit) (1)   (1)  
Amortization of net transition liability   1   2
Amortization of actuarial loss (gain) 15 9 29 15
Net periodic costs 31 25 62 44
Duke Energy Progress [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 6 7 11 13
Interest cost on benefit obligation 12 14 25 28
Expected return on plan assets (24) (23) (47) (47)
Amortization of prior service cost (credit) 0 2 0 4
Amortization of actuarial loss (gain) 12 10 23 19
Other 0 0    
Net periodic costs 6 10 12 17
Duke Energy Progress [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest cost on benefit obligation 1 1 1 1
Net periodic costs 1 1 1 1
Duke Energy Progress [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 3 2 6 4
Interest cost on benefit obligation 6 6 12 11
Expected return on plan assets       0
Amortization of prior service cost (credit) (1)   (1)  
Amortization of net transition liability       0
Amortization of actuarial loss (gain) 9 6 18 8
Net periodic costs 17 14 35 23
Duke Energy Florida [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 7 7 15 14
Interest cost on benefit obligation 14 15 27 28
Expected return on plan assets (22) (20) (44) (40)
Amortization of prior service cost (credit) (1) 0 (1) 0
Amortization of actuarial loss (gain) 13 12 25 23
Other 0 0    
Net periodic costs 11 14 22 25
Duke Energy Florida [Member] | Non-Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Interest cost on benefit obligation 1 1 1 1
Net periodic costs 1 1 1 1
Duke Energy Florida [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 2 1 4 3
Interest cost on benefit obligation 4 4 8 9
Expected return on plan assets       (1)
Amortization of net transition liability   1   2
Amortization of actuarial loss (gain) 4 3 8 5
Net periodic costs 10 9 20 18
Duke Energy Ohio [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 1 1 3 3
Interest cost on benefit obligation 6 8 11 16
Expected return on plan assets (7) (11) (15) (22)
Amortization of prior service cost (credit) 0 0 0 0
Amortization of actuarial loss (gain) 3 3 6 5
Other 0 0    
Net periodic costs 3 [5] 1 [5] 5 [6] 2 [6]
Regulatory asset amortization 1 1 3 3
Duke Energy Ohio [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost     0 0
Interest cost on benefit obligation 1 0 1 1
Expected return on plan assets       0
Amortization of actuarial loss (gain) (1) 0 (1) (1)
Net periodic costs 0 0 0 0
Regulatory asset amortization 0 0 1 1
Duke Energy Indiana [Member] | Qualified Pension Plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 3 3 6 5
Interest cost on benefit obligation 7 7 14 15
Expected return on plan assets (11) (11) (22) (23)
Amortization of prior service cost (credit) 0 0 0 1
Amortization of actuarial loss (gain) 5 4 11 7
Other 0 0    
Net periodic costs 4 3 9 5
Duke Energy Indiana [Member] | Other Post-Retirement Benefit plans [Member]
        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost     0 0
Interest cost on benefit obligation 2 2 3 4
Expected return on plan assets   (1)   (1)
Amortization of prior service cost (credit)   1   1
Amortization of actuarial loss (gain) 0 (1) 0 (1)
Net periodic costs $ 2 $ 1 $ 3 $ 3
[1] Duke Energy amounts exclude $3 million and $4 million for the three months ended June 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
[2] Duke Energy amounts exclude $6 million and $7 million for the six months ended June 30, 2013, and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
[3] Duke Energy amounts exclude $2 million for each of the three months ended June 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
[4] Duke Energy amounts exclude $4 million for each of the six months ended June 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
[5] Duke Energy Ohio amounts exclude $1 million for each of the three months ended June 30, 2013 and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.
[6] Duke Energy Ohio amounts exclude $3 million for each of the six months ended June 30, 2013, and 2012, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy’s merger with Cinergy.