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Commitments and Contingencies (Table) | 9 Months Ended
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Sep. 30, 2018
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves | Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below.
(in millions) |
Duke Energy | $ | 57 |
Duke Energy Carolinas | 17 |
Duke Energy Ohio | 30 |
Piedmont | 2 |
Reserve, Environmental Cost [Member] |
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Legal Reserves | The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts Payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.
| Nine Months Ended September 30, 2018
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Balance at beginning of period | $ | 81 |  |  | $ | 10 |  |  | $ | 15 |  |  | $ | 3 |  |  | $ | 12 |  |  | $ | 47 |  |  | $ | 5 |  |  | $ | 2 |
Provisions/adjustments | 7 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | (1 | ) |  | 3 |  |  | 1 |  |  | — |
Cash reductions | (20 | ) |  | (2 | ) |  | (5 | ) |  | (1 | ) |  | (4 | ) |  | (12 | ) |  | (1 | ) |  | — |
Balance at end of period | $ | 68 |  |  | $ | 11 |  |  | $ | 12 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | 38 |  |  | $ | 5 |  |  | $ | 2 |
| Nine Months Ended September 30, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Balance at beginning of period | $ | 98 |  |  | $ | 10 |  |  | $ | 18 |  |  | $ | 3 |  |  | $ | 14 |  |  | $ | 59 |  |  | $ | 10 |  |  | $ | 1 |
Provisions/adjustments | (1 | ) |  | 2 |  |  | 1 |  |  | — |  |  | 1 |  |  | (3 | ) |  | (2 | ) |  | 1 |
Cash reductions | (13 | ) |  | (2 | ) |  | (3 | ) |  | — |  |  | (3 | ) |  | (7 | ) |  | (1 | ) |  | — |
Balance at end of period | $ | 84 |  |  | $ | 10 |  |  | $ | 16 |  |  | $ | 3 |  |  | $ | 12 |  |  | $ | 49 |  |  | $ | 7 |  |  | $ | 2 |
Reserve, Legal [Member] |
Valuation and Qualifying Accounts Disclosure [Line Items] |
Schedule of Legal Reserves | The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves and the exit obligation related to the termination of an EPC contract discussed above. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Accounts payable and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above.
(in millions) | September 30, 2018 |  |  | December 31, 2017 |
Reserves for Legal Matters |  |  |
Duke Energy | $ | 63 |  |  | $ | 88 |
Duke Energy Carolinas | 11 |  |  | 30 |
Progress Energy | 50 |  |  | 55 |
Duke Energy Progress | 11 |  |  | 13 |
Duke Energy Florida | 23 |  |  | 24 |
Piedmont | 1 |  |  | 2 |

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- Definition Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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