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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 28 $ 28 $ 85 $ 87
Interest cost on projected benefit obligation 82 86 247 258
Expected return on plan assets (154) (147) (462) (441)
Amortization of actuarial loss 9 2 25 7
Amortization of prior service credit (3) (3) (10) (10)
Amortization of settlement charges 17 5 26 14
Net periodic pension costs (21) (29) (89) (85)
Duke Energy Carolinas        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 9 9 28 28
Interest cost on projected benefit obligation 19 21 59 63
Expected return on plan assets (41) (40) (122) (120)
Amortization of actuarial loss 2 0 6 1
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 5 3 9 7
Net periodic pension costs (6) (7) (20) (21)
Progress Energy        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 8 9 24 25
Interest cost on projected benefit obligation 26 26 78 80
Expected return on plan assets (55) (50) (163) (149)
Amortization of actuarial loss 2 1 7 3
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 7 1 9 3
Net periodic pension costs (12) (13) (45) (38)
Duke Energy Progress        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 5 5 15 15
Interest cost on projected benefit obligation 12 12 36 37
Expected return on plan assets (25) (24) (75) (70)
Amortization of actuarial loss 1 0 4 1
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 6 1 8 3
Net periodic pension costs (1) (6) (12) (14)
Duke Energy Florida        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 3 3 10 10
Interest cost on projected benefit obligation 14 14 42 43
Expected return on plan assets (29) (26) (87) (78)
Amortization of actuarial loss 1 1 3 2
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 0 0 1 1
Net periodic pension costs (11) (8) (31) (22)
Duke Energy Ohio        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 2 2
Interest cost on projected benefit obligation 5 4 13 13
Expected return on plan assets (6) (6) (19) (18)
Amortization of actuarial loss 0 0 1 0
Amortization of prior service credit 0 0 0 0
Amortization of settlement charges 2 0 2 0
Net periodic pension costs 2 (1) (1) (3)
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 20
Expected return on plan assets (10) (10) (31) (30)
Amortization of actuarial loss 1 1 3 2
Amortization of prior service credit 0 0 (1) (1)
Amortization of settlement charges 0 0 1 1
Net periodic pension costs (2) (2) (5) (4)
Piedmont        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 1 1 3 3
Interest cost on projected benefit obligation 2 2 7 7
Expected return on plan assets (5) (5) (15) (15)
Amortization of actuarial loss 1 0 2 0
Amortization of prior service credit (1) (1) (5) (5)
Amortization of settlement charges 2 1 4 3
Net periodic pension costs $ 0 $ (2) $ (4) $ (7)