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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |
Defined Contribution Plan Disclosures | The following table includes employer contributions made by Duke Energy and expensed by the Subsidiary Registrants.
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Three Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 48 |  |  | $ | 15 |  |  | $ | 13 |  |  | $ | 9 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
2017 | 39 |  |  | 13 |  |  | 12 |  |  | 8 |  |  | 4 |  |  | 1 |  |  | 2 |  |  | 1 |
Six Months Ended June 30, |  |  |  |  |  |  |  |  |  |  |  |
2018 | $ | 118 |  |  | $ | 38 |  |  | $ | 32 |  |  | $ | 22 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 6 |
2017 | 104 |  |  | 35 |  |  | 30 |  |  | 21 |  |  | 9 |  |  | 2 |  |  | 5 |  |  | 3 |
Qualified Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The following table presents contributions made by the Duke Energy Registrants to their qualified defined benefit pension plans during the six months ended June 30, 2018.
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Indiana |
Contributions | $ | 141 |  |  | $ | 46 |  |  | $ | 45 |  |  | $ | 25 |  |  | $ | 20 |  |  | $ | 8 |
Components of Net Periodic Pension Costs | The following tables include the components of net periodic pension costs for qualified pension plans.
| Three Months Ended June 30, 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 |  |  | $ | 8 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 2 |
Interest cost on projected benefit obligation | 75 |  |  | 18 |  |  | 22 |  |  | 10 |  |  | 12 |  |  | 4 |  |  | 6 |  |  | 3 |
Expected return on plan assets | (140 | ) |  | (37 | ) |  | (43 | ) |  | (21 | ) |  | (23 | ) |  | (7 | ) |  | (11 | ) |  | (6 | )
Amortization of actuarial loss | 33 |  |  | 7 |  |  | 11 |  |  | 5 |  |  | 6 |  |  | 1 |  |  | 2 |  |  | 3 |
Amortization of prior service credit | (8 | ) |  | (2 | ) |  | (1 | ) |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (3 | )
Net periodic pension costs | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (1 | )
| Three Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 40 |  |  | $ | 12 |  |  | $ | 12 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 82 |  |  | 20 |  |  | 25 |  |  | 12 |  |  | 13 |  |  | 5 |  |  | 7 |  |  | 3 |
Expected return on plan assets | (136 | ) |  | (36 | ) |  | (43 | ) |  | (21 | ) |  | (21 | ) |  | (7 | ) |  | (11 | ) |  | (6 | )
Amortization of actuarial loss | 36 |  |  | 8 |  |  | 14 |  |  | 6 |  |  | 7 |  |  | 1 |  |  | 3 |  |  | 3 |
Amortization of prior service credit | (6 | ) |  | (2 | ) |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (1 | )
Other | 2 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | 18 |  |  | $ | 2 |  |  | $ | 8 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 3 |
| Six Months Ended June 30, 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 | $ | 90 |  |  | $ | 30 |  |  | $ | 26 |  |  | $ | 15 |  |  | $ | 11 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 4 |
Interest cost on projected benefit obligation | 150 |  |  | 36 |  |  | 46 |  |  | 21 |  |  | 25 |  |  | 9 |  |  | 12 |  |  | 6 |
Expected return on plan assets | (280 | ) |  | (74 | ) |  | (88 | ) |  | (42 | ) |  | (46 | ) |  | (14 | ) |  | (21 | ) |  | (12 | )
Amortization of actuarial loss | 66 |  |  | 14 |  |  | 22 |  |  | 10 |  |  | 12 |  |  | 2 |  |  | 4 |  |  | 6 |
Amortization of prior service credit | (16 | ) |  | (4 | ) |  | (2 | ) |  | (1 | ) |  | (1 | ) |  | — |  |  | — |  |  | (6 | )
Net periodic pension costs | $ | 10 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (2 | )
| Six Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 80 |  |  | $ | 24 |  |  | $ | 24 |  |  | $ | 12 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 6 |
Interest cost on projected benefit obligation | 164 |  |  | 40 |  |  | 50 |  |  | 24 |  |  | 26 |  |  | 10 |  |  | 14 |  |  | 6 |
Expected return on plan assets | (272 | ) |  | (71 | ) |  | (86 | ) |  | (42 | ) |  | (42 | ) |  | (14 | ) |  | (22 | ) |  | (12 | )
Amortization of actuarial loss | 72 |  |  | 16 |  |  | 28 |  |  | 12 |  |  | 14 |  |  | 2 |  |  | 6 |  |  | 6 |
Amortization of prior service credit | (12 | ) |  | (4 | ) |  | (2 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (2 | )
Other | 4 |  |  | — |  |  | 2 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |
Net periodic pension costs | $ | 36 |  |  | $ | 5 |  |  | $ | 16 |  |  | $ | 7 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 5 |
Non-Qualified Pension Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Components of Net Periodic Pension Costs | The following tables include the components of net periodic pension costs for non-qualified pension plans for registrants with non-qualified pension costs.
| Three Months Ended June 30, 2018
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on projected benefit obligation | 3 |  |  | — |  |  | 1 |  |  | 1 |  |  | 1 |
Amortization of actuarial loss | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit | (1 | ) |  | — |  |  | — |  |  | — |  |  | — |
Net periodic pension costs | $ | 5 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
| Three Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |
Interest cost on projected benefit obligation | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |
Amortization of actuarial loss | 2 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic pension costs | $ | 5 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
| Six Months Ended June 30, 2018
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on projected benefit obligation | 6 |  |  | — |  |  | 2 |  |  | 1 |  |  | 1 |
Amortization of actuarial loss | 4 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service (credit) cost | (1 | ) |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic pension costs | $ | 10 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |
| Six Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |
Interest cost on projected benefit obligation | $ | 6 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |
Amortization of actuarial loss | 4 |  |  | — |  |  | 2 |  |  | — |  |  | — |
Net periodic pension costs | $ | 10 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 1 |
Other Post-Retirement Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Components of Net Periodic Pension Costs | The following tables include the components of net periodic other post-retirement benefit costs.
| Three Months Ended June 30, 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 | $ | 2 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on accumulated post-retirement benefit obligation | 7 |  |  | 1 |  |  | 2 |  |  | 2 |  |  | 2 |  |  | 1 |  |  | 1 |  |  | — |
Expected return on plan assets | (4 | ) |  | (2 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss | 2 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |
Amortization of prior service credit | (5 | ) |  | (1 | ) |  | (2 | ) |  | — |  |  | (2 | ) |  | — |  |  | — |  |  | (1 | )
Net periodic other post-retirement benefit costs | $ | 2 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | (1 | )
| Three Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on accumulated post-retirement benefit obligation | 9 |  |  | 2 |  |  | 3 |  |  | 2 |  |  | 2 |  |  | — |  |  | — |  |  | — |
Expected return on plan assets | (4 | ) |  | (2 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss (gain) | 2 |  |  | (1 | ) |  | 5 |  |  | 3 |  |  | 2 |  |  | (1 | ) |  | — |  |  | — |
Amortization of prior service credit | (29 | ) |  | (2 | ) |  | (21 | ) |  | (13 | ) |  | (7 | ) |  | — |  |  | — |  |  | — |
Net periodic other post-retirement benefit costs | $ | (21 | ) |  | $ | (3 | ) |  | $ | (13 | ) |  | $ | (8 | ) |  | $ | (3 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
| Six Months Ended June 30, 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 | $ | 3 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on accumulated post-retirement benefit obligation | 14 |  |  | 3 |  |  | 6 |  |  | 3 |  |  | 3 |  |  | 1 |  |  | 2 |  |  | — |
Expected return on plan assets | (6 | ) |  | (4 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss | 3 |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | — |
Amortization of prior service credit | (10 | ) |  | (2 | ) |  | (4 | ) |  | — |  |  | (3 | ) |  | — |  |  | — |  |  | (1 | )
Net periodic other post-retirement benefit costs | $ | 4 |  |  | $ | (1 | ) |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | (1 | )
| Six Months Ended June 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Service cost | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost on accumulated post-retirement benefit obligation | 18 |  |  | 4 |  |  | 7 |  |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | — |
Expected return on plan assets | (7 | ) |  | (4 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial loss (gain) | 4 |  |  | (2 | ) |  | 10 |  |  | 6 |  |  | 4 |  |  | (1 | ) |  | — |  |  | — |
Amortization of prior service credit | (58 | ) |  | (4 | ) |  | (42 | ) |  | (27 | ) |  | (15 | ) |  | — |  |  | — |  |  | — |
Net periodic other post-retirement benefit costs | $ | (41 | ) |  | $ | (6 | ) |  | $ | (25 | ) |  | $ | (17 | ) |  | $ | (7 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |

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