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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
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 qualified pension plans.
| Three Months Ended June 30, 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 |  |  | $ | 10 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost on projected benefit obligation | 82 |  |  | 21 |  |  | 26 |  |  | 12 |  |  | 13 |  |  | 4 |  |  | 7 |  |  | 3 |
Expected return on plan assets | (143 | ) |  | (37 | ) |  | (45 | ) |  | (21 | ) |  | (22 | ) |  | (6 | ) |  | (10 | ) |  | (6 | )
Amortization of actuarial loss | 25 |  |  | 5 |  |  | 9 |  |  | 3 |  |  | 6 |  |  | — |  |  | 1 |  |  | 1 |
Amortization of prior service credit | (8 | ) |  | (2 | ) |  | — |  |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | (2 | )
Net periodic pension costs | $ | (7 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | (1 | ) |  | $ | 2 |  |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | (2 | )
| 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 | )
| Six Months Ended June 30, 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 | $ | 74 |  |  | $ | 24 |  |  | $ | 21 |  |  | $ | 12 |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |
Interest cost on projected benefit obligation | 165 |  |  | 41 |  |  | 52 |  |  | 24 |  |  | 27 |  |  | 9 |  |  | 13 |  |  | 6 |
Expected return on plan assets | (286 | ) |  | (75 | ) |  | (89 | ) |  | (44 | ) |  | (44 | ) |  | (14 | ) |  | (21 | ) |  | (11 | )
Amortization of actuarial loss | 49 |  |  | 11 |  |  | 18 |  |  | 6 |  |  | 12 |  |  | 1 |  |  | 3 |  |  | 3 |
Amortization of prior service credit | (16 | ) |  | (4 | ) |  | (1 | ) |  | (1 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | (5 | )
Net periodic pension costs | $ | (14 | ) |  | $ | (3 | ) |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 4 |  |  | $ | (2 | ) |  | $ | (2 | ) |  | $ | (4 | )
| 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 | )

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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