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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS DEFINED BENEFIT RETIREMENT PLANS Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants. QUALIFIED PENSION PLANS The following tables include the components of net periodic pension costs for qualified pension plans.
| Three Months Ended March 31, 2019
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 37 |  |  | $ | 12 |  |  | $ | 11 |  |  | $ | 6 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost on projected benefit obligation | 83 |  |  | 20 |  |  | 26 |  |  | 12 |  |  | 14 |  |  | 5 |  |  | 6 |  |  | 3 |
Expected return on plan assets | (143 | ) |  | (38 | ) |  | (44 | ) |  | (23 | ) |  | (22 | ) |  | (8 | ) |  | (11 | ) |  | (5 | )
Amortization of actuarial loss | 24 |  |  | 6 |  |  | 9 |  |  | 3 |  |  | 6 |  |  | 1 |  |  | 2 |  |  | 2 |
Amortization of prior service credit | (8 | ) |  | (2 | ) |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (3 | )
Net periodic pension costs | $ | (7 | ) |  | $ | (2 | ) |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 2 |  |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (2 | )
| Three Months Ended March 31, 2018
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 45 |  |  | $ | 15 |  |  | $ | 13 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost on projected benefit obligation | 75 |  |  | 18 |  |  | 24 |  |  | 11 |  |  | 13 |  |  | 5 |  |  | 6 |  |  | 3 |
Expected return on plan assets | (140 | ) |  | (37 | ) |  | (45 | ) |  | (21 | ) |  | (23 | ) |  | (7 | ) |  | (10 | ) |  | (6 | )
Amortization of actuarial loss | 33 |  |  | 7 |  |  | 11 |  |  | 5 |  |  | 6 |  |  | 1 |  |  | 2 |  |  | 3 |
Amortization of prior service credit | (8 | ) |  | (2 | ) |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (3 | )
Net periodic pension costs | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | (1 | )
NON-QUALIFIED PENSION PLANS Net periodic pension costs for non-qualified pension plans were not material for the three months ended March 31, 2019, and 2018. OTHER POST-RETIREMENT BENEFIT PLANS Net periodic costs for other post-retirement benefit plans were not material for the three months ended March 31, 2019, and 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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