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Employee Benefit Plans - Net Periodic Pension Costs (Details) - Qualified Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 26 $ 28 $ 80 $ 85
Interest cost on projected benefit obligation 83 82 247 247
Expected return on plan assets (149) (154) (447) (462)
Amortization of actuarial loss 16 9 46 25
Amortization of prior service credit (4) (3) (10) (10)
Amortization of settlement charges 6 17 19 26
Net periodic pension costs (22) (21) (65) (89)
Duke Energy Carolinas        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 9 9 27 28
Interest cost on projected benefit obligation 20 19 59 59
Expected return on plan assets (38) (41) (114) (122)
Amortization of actuarial loss 3 2 10 6
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 3 5 9 9
Net periodic pension costs (3) (6) (9) (20)
Progress Energy        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 8 8 23 24
Interest cost on projected benefit obligation 25 26 77 78
Expected return on plan assets (55) (55) (165) (163)
Amortization of actuarial loss 5 2 14 7
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 1 7 5 9
Net periodic pension costs (16) (12) (46) (45)
Duke Energy Progress        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 5 5 14 15
Interest cost on projected benefit obligation 11 12 34 36
Expected return on plan assets (24) (25) (73) (75)
Amortization of actuarial loss 2 1 6 4
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 1 6 4 8
Net periodic pension costs (5) (1) (15) (12)
Duke Energy Florida        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 3 3 9 10
Interest cost on projected benefit obligation 14 14 43 42
Expected return on plan assets (30) (29) (90) (87)
Amortization of actuarial loss 2 1 6 3
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 1 0 2 1
Net periodic pension costs (10) (11) (30) (31)
Duke Energy Ohio        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 2 2
Interest cost on projected benefit obligation 4 5 12 13
Expected return on plan assets (6) (6) (17) (19)
Amortization of actuarial loss 1 0 2 1
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 0 2 0 2
Net periodic pension costs 0 2 (1) (1)
Duke Energy Indiana        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 4 4
Interest cost on projected benefit obligation 6 6 19 19
Expected return on plan assets (10) (10) (30) (31)
Amortization of actuarial loss 2 1 4 3
Amortization of prior service credit 0 0 (1) (1)
Amortization of settlement charges 0 0 1 1
Net periodic pension costs (1) (2) (3) (5)
Piedmont        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 3 3
Interest cost on projected benefit obligation 3 2 8 7
Expected return on plan assets (5) (5) (15) (15)
Amortization of actuarial loss 1 1 3 2
Amortization of prior service credit (2) (1) (5) (5)
Amortization of settlement charges 1 2 3 4
Net periodic pension costs $ (1) $ 0 $ (3) $ (4)