XML 168 R125.htm IDEA: XBRL DOCUMENT v3.25.1
Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost $ 27 $ 28
Interest cost on projected benefit obligation 82 82
Expected return on plan assets (149) (154)
Amortization of actuarial loss 15 8
Amortization of prior service credit (3) (3)
Amortization of settlement charges 6 5
Net periodic pension costs (22) (34)
Duke Energy Carolinas    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 9 9
Interest cost on projected benefit obligation 19 20
Expected return on plan assets (38) (41)
Amortization of actuarial loss 4 2
Amortization of prior service credit 0 0
Amortization of settlement charges 3 2
Net periodic pension costs (3) (8)
Progress Energy    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 7 8
Interest cost on projected benefit obligation 26 26
Expected return on plan assets (55) (54)
Amortization of actuarial loss 5 2
Amortization of prior service credit 0 0
Amortization of settlement charges 2 1
Net periodic pension costs (15) (17)
Duke Energy Progress    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 5 5
Interest cost on projected benefit obligation 11 12
Expected return on plan assets (24) (25)
Amortization of actuarial loss 2 1
Amortization of prior service credit 0 0
Amortization of settlement charges 1 1
Net periodic pension costs (5) (6)
Duke Energy Florida    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 3 3
Interest cost on projected benefit obligation 14 14
Expected return on plan assets (30) (29)
Amortization of actuarial loss 2 1
Amortization of prior service credit 0 0
Amortization of settlement charges 1 0
Net periodic pension costs (10) (11)
Duke Energy Ohio    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 0 1
Interest cost on projected benefit obligation 4 4
Expected return on plan assets (5) (6)
Amortization of actuarial loss 1 0
Amortization of prior service credit 0 0
Amortization of settlement charges 0 0
Net periodic pension costs 0 (1)
Duke Energy Indiana    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 1 2
Interest cost on projected benefit obligation 7 6
Expected return on plan assets (10) (10)
Amortization of actuarial loss 1 1
Amortization of prior service credit 0 0
Amortization of settlement charges 0 0
Net periodic pension costs (1) (1)
Piedmont    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 1 1
Interest cost on projected benefit obligation 3 2
Expected return on plan assets (5) (5)
Amortization of actuarial loss 1 1
Amortization of prior service credit (2) (2)
Amortization of settlement charges 1 1
Net periodic pension costs $ (1) $ (2)