v3.25.2
Employee Benefit Plans (Details) - Qualified Pension Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 27 $ 29 $ 54 $ 57
Interest cost on projected benefit obligation 82 83 164 165
Expected return on plan assets (149) (154) (298) (308)
Amortization of actuarial loss 15 8 30 16
Amortization of prior service credit (3) (4) (6) (7)
Amortization of settlement charges 7 4 13 9
Net periodic pension costs (21) (34) (43) (68)
Duke Energy Carolinas        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 9 10 18 19
Interest cost on projected benefit obligation 20 20 39 40
Expected return on plan assets (38) (40) (76) (81)
Amortization of actuarial loss 3 2 7 4
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 3 2 6 4
Net periodic pension costs (3) (6) (6) (14)
Progress Energy        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 8 8 15 16
Interest cost on projected benefit obligation 26 26 52 52
Expected return on plan assets (55) (54) (110) (108)
Amortization of actuarial loss 4 3 9 5
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 2 1 4 2
Net periodic pension costs (15) (16) (30) (33)
Duke Energy Progress        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 4 5 9 10
Interest cost on projected benefit obligation 12 12 23 24
Expected return on plan assets (25) (25) (49) (50)
Amortization of actuarial loss 2 2 4 3
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 2 1 3 2
Net periodic pension costs (5) (5) (10) (11)
Duke Energy Florida        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 3 4 6 7
Interest cost on projected benefit obligation 15 14 29 28
Expected return on plan assets (30) (29) (60) (58)
Amortization of actuarial loss 2 1 4 2
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 0 1 1 1
Net periodic pension costs (10) (9) (20) (20)
Duke Energy Ohio        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 0 1 1
Interest cost on projected benefit obligation 4 4 8 8
Expected return on plan assets (6) (7) (11) (13)
Amortization of actuarial loss 0 1 1 1
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 0 0 0 0
Net periodic pension costs (1) (2) (1) (3)
Duke Energy Indiana        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 2 1 3 3
Interest cost on projected benefit obligation 6 7 13 13
Expected return on plan assets (10) (11) (20) (21)
Amortization of actuarial loss 1 1 2 2
Amortization of prior service credit (1) (1) (1) (1)
Amortization of settlement charges 1 1 1 1
Net periodic pension costs (1) (2) (2) (3)
Piedmont        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 2 2
Interest cost on projected benefit obligation 2 3 5 5
Expected return on plan assets (5) (5) (10) (10)
Amortization of actuarial loss 1 0 2 1
Amortization of prior service credit (1) (2) (3) (4)
Amortization of settlement charges 1 1 2 2
Net periodic pension costs $ (1) $ (2) $ (2) $ (4)