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Organization and Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2018
Organization And Basis Of Presentation [Line Items] |
Schedule of Cash, Cash Equivalents and Restricted Cash | The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets.
| September 30, 2018 |  | December 31, 2017
|  |  | Duke |  |  |  |  | Duke |
| Duke |  | Progress |  | Energy |  |  | Duke |  | Progress |  | Energy |
| Energy |  | Energy |  | Florida |  |  | Energy |  | Energy |  | Florida |
Current Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 303 |  | $ | 43 |  | $ | 20 |  |  | $ | 358 |  | $ | 40 |  | $ | 13 |
Other | 139 |  | 14 |  | 14 |  |  | 138 |  | 40 |  | 40 |
Other Noncurrent Assets |  |  |  |  |  |  |
Other | 7 |  | 6 |  | — |  |  | 9 |  | 7 |  | — |
Total cash, cash equivalents and restricted cash | $ | 449 |  | $ | 63 |  | $ | 34 |  |  | $ | 505 |  | $ | 87 |  | $ | 53 |
Schedule of Utility Inventory | The components of inventory are presented in the tables below.
| 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 |
Materials and supplies | $ | 2,283 |  |  | $ | 758 |  |  | $ | 1,071 |  |  | $ | 748 |  |  | $ | 323 |  |  | $ | 87 |  |  | $ | 294 |  |  | $ | 1 |
Coal | 515 |  |  | 176 |  |  | 187 |  |  | 99 |  |  | 88 |  |  | 14 |  |  | 138 |  |  | — |
Natural gas, oil and other fuel | 342 |  |  | 42 |  |  | 215 |  |  | 109 |  |  | 106 |  |  | 34 |  |  | 2 |  |  | 50 |
Total inventory | $ | 3,140 |  |  | $ | 976 |  |  | $ | 1,473 |  |  | $ | 956 |  |  | $ | 517 |  |  | $ | 135 |  |  | $ | 434 |  |  | $ | 51 |
| December 31, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Materials and supplies | $ | 2,293 |  |  | $ | 744 |  |  | $ | 1,118 |  |  | $ | 774 |  |  | $ | 343 |  |  | $ | 82 |  |  | $ | 309 |  |  | $ | 2 |
Coal | 603 |  |  | 192 |  |  | 255 |  |  | 139 |  |  | 116 |  |  | 17 |  |  | 139 |  |  | — |
Natural gas, oil and other fuel | 354 |  |  | 35 |  |  | 219 |  |  | 104 |  |  | 115 |  |  | 34 |  |  | 2 |  |  | 64 |
Total inventory | $ | 3,250 |  |  | $ | 971 |  |  | $ | 1,592 |  |  | $ | 1,017 |  |  | $ | 574 |  |  | $ | 133 |  |  | $ | 450 |  |  | $ | 66 |
Schedule of Excise Taxes | Excise taxes accounted for on a gross basis within both Operating Revenues and Property and other taxes on the Condensed Consolidated Statements of Operations were as follows.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Duke Energy | $ | 114 |  |  | $ | 107 |  |  | $ | 308 |  |  | $ | 289 |
Duke Energy Carolinas | 10 |  |  | 9 |  |  | 27 |  |  | 27 |
Progress Energy | 71 |  |  | 67 |  |  | 181 |  |  | 168 |
Duke Energy Progress | 5 |  |  | 5 |  |  | 15 |  |  | 14 |
Duke Energy Florida | 66 |  |  | 62 |  |  | 166 |  |  | 154 |
Duke Energy Ohio | 26 |  |  | 24 |  |  | 81 |  |  | 75 |
Duke Energy Indiana | 6 |  |  | 6 |  |  | 17 |  |  | 16 |
Piedmont | 1 |  |  | 1 |  |  | 2 |  |  | 3 |
Schedule of New Accounting Pronouncements | Leases. In February 2016, the FASB issued revised accounting guidance for leases. The core principle of this guidance is that a lessee should recognize the assets and liabilities that arise from leases on the balance sheet. For Duke Energy, this guidance is effective for interim and annual periods beginning January 1, 2019. The guidance will be applied using a modified retrospective approach. Upon adoption, agreements considered leases for the use of certain aircraft, space on communication towers, industrial equipment, fleet vehicles, fuel transportation (barges and railcars), land and office space will be recognized on the balance sheet. Duke Energy expects to elect certain of the following practical expedients upon adoption:
Practical Expedient | Description | Election
Package of transition practical expedients (for leases commenced prior to adoption date and must be adopted as a package) | Do not need to 1) reassess whether any expired or existing contracts are/or contain leases, 2) reassess the lease classification for any expired or existing leases and 3) reassess initial direct costs for any existing leases. | Duke Energy plans to elect this practical expedient.
Short-term lease expedient (elect by class of underlying asset) | Elect as an accounting policy to not apply the recognition requirements to short-term leases by asset class. | Duke Energy plans to elect this practical expedient for all asset classes.
Lease and non-lease components (elect by class of underlying asset) | Elect as an accounting policy to not separate non-lease components from lease components and instead account for each lease and associated non-lease component as a single lease component by asset class. | Duke Energy is currently assessing the election of this practical expedient.
Hindsight expedient (when determining lease term) | Elect to use hindsight to determine the lease term. | Duke Energy plans to elect this practical expedient.
Existing and expired land easements not previously accounted for as leases | Elect to not evaluate existing or expired easements under the new guidance and carry forward current accounting treatment. | Duke Energy plans to elect this practical expedient.
Comparative reporting requirements for initial adoption | Elect to apply transition requirements at adoption date, recognize cumulative effect adjustment to retained earnings in period of adoption and not apply ASC 842 to comparative periods, including disclosures. | Duke Energy plans to elect this practical expedient.
Lessor expedient (elect by class of underlying asset) | Elect as an accounting policy to aggregate non-lease components with the related lease component when specified conditions are met by asset class. Account for the combined component based on its predominant characteristic (revenue or operating lease). | Duke Energy is currently assessing the election of this practical expedient.

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