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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Organization And Basis Of Presentation [Line Items] |
Schedule of Current and Noncurrent Assets and Liabilities | The following table provides a description of amounts included in Other within Current Assets or Current Liabilities that exceed 5 percent of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2018, or 2017.
|  |  | December 31,
(in millions) | Location |  | 2018 |  |  | 2017 |
Duke Energy |  |  |  |  |
Income taxes receivable | Current Assets |  | $ | 729 |  |  | $ | 330 |
Accrued compensation | Current Liabilities |  | 793 |  |  | 757 |
Duke Energy Carolinas |  |  |  |  |
Accrued compensation | Current Liabilities |  | $ | 251 |  |  | $ | 252 |
Progress Energy |  |  |  |  |  |  |
Income taxes receivable | Current Assets |  | $ | 66 |  |  | $ | 278 |
Customer deposits | Current Liabilities |  | 345 |  |  | 338 |
Duke Energy Progress |  |  |  |  |  |  |
Customer deposits | Current Liabilities |  | $ | 137 |  |  | $ | 129 |
Accrued compensation | Current Liabilities |  | 130 |  |  | 132 |
Duke Energy Florida |  |  |  |  |  |  |
Customer deposits | Current Liabilities |  | $ | 208 |  |  | $ | 208 |
Other accrued liabilities | Current Liabilities |  | 85 |  |  | 16 |
Duke Energy Ohio |  |  |  |  |  |  |
Income taxes receivable | Current Assets |  | $ | 13 |  |  | $ | 36 |
Customer deposits | Current Liabilities |  | 44 |  |  | 46 |
Duke Energy Indiana |  |  |  |  |  |  |
Customer deposits | Current Liabilities |  | $ | 47 |  |  | $ | 45 |
Piedmont |  |  |  |  |
Income taxes receivable | Current Assets |  | $ | 11 |  |  | $ | 43 |
Schedule of Cash and Cash Equivalents | The following table presents the components of cash, cash equivalents and restricted cash included in the Consolidated Balance Sheets.
| December 31, 2018 |  | December 31, 2017
|  |  | Duke |  |  |  |  | Duke |
| Duke |  | Progress |  | Energy |  |  | Duke |  | Progress |  | Energy |
| Energy |  | Energy |  | Florida |  |  | Energy |  | Energy |  | Florida |
Current Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 442 |  | $ | 67 |  | $ | 36 |  |  | $ | 358 |  | $ | 40 |  | $ | 13 |
Other | 141 |  | 39 |  | 39 |  |  | 138 |  | 40 |  | 40 |
Other Noncurrent Assets |  |  |  |  |  |  |
Other | 8 |  | 6 |  | — |  |  | 9 |  | 7 |  | — |
Total cash, cash equivalents and restricted cash | $ | 591 |  | $ | 112 |  | $ | 75 |  |  | $ | 505 |  | $ | 87 |  | $ | 53 |
Components Of Inventory | The components of inventory are presented in the tables below.
| December 31, 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 | $ | 2,238 |  |  | $ | 731 |  |  | $ | 1,049 |  |  | $ | 734 |  |  | $ | 315 |  |  | $ | 84 |  |  | $ | 312 |  |  | $ | 2 |
Coal | 491 |  |  | 175 |  |  | 192 |  |  | 106 |  |  | 86 |  |  | 14 |  |  | 109 |  |  | — |
Natural gas, oil and other | 355 |  |  | 42 |  |  | 218 |  |  | 114 |  |  | 103 |  |  | 28 |  |  | 1 |  |  | 68 |
Total inventory | $ | 3,084 |  |  | $ | 948 |  |  | $ | 1,459 |  |  | $ | 954 |  |  | $ | 504 |  |  | $ | 126 |  |  | $ | 422 |  |  | $ | 70 |
| 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 | 354 |  |  | 35 |  |  | 219 |  |  | 104 |  |  | 115 |  |  | 34 |  |  | 2 |  |  | 64 |
Total inventory | $ | 3,250 |  |  | $ | 971 |  |  | $ | 1,592 |  |  | $ | 1,017 |  |  | $ | 574 |  |  | $ | 133 |  |  | $ | 450 |  |  | $ | 66 |
Schedule Of Property, Plant And Equipment | The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows.
| Years Ended December 31,
| 2018 |  |  | 2017 |  |  | 2016 |
Duke Energy | 3.0 | % |  | 2.8 | % |  | 2.8 | %
Duke Energy Carolinas | 2.8 | % |  | 2.8 | % |  | 2.8 | %
Progress Energy | 2.9 | % |  | 2.6 | % |  | 2.7 | %
Duke Energy Progress | 2.9 | % |  | 2.6 | % |  | 2.6 | %
Duke Energy Florida | 3.0 | % |  | 2.8 | % |  | 2.8 | %
Duke Energy Ohio | 2.8 | % |  | 2.8 | % |  | 2.6 | %
Duke Energy Indiana | 3.3 | % |  | 3.0 | % |  | 3.1 | %
Piedmont(a) | 2.5 | % |  | 2.3 | % |  |
(a) | Piedmont's weighted average depreciation rate was 2.4 percent for the annualized two months ended December 31, 2016, and for the year ended October 31, 2016.
The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.
| December 31, 2018
| Estimated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Useful |  |  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Life |  | Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | (Years) |  | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont
Land |  |  | $ | 2,072 |  |  | $ | 472 |  |  | $ | 868 |  |  | $ | 445 |  |  | $ | 423 |  |  | $ | 136 |  |  | $ | 116 |  |  | $ | 448 |
Plant – Regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 15-100 |  | 100,706 |  |  | 38,468 |  |  | 42,760 |  |  | 26,147 |  |  | 16,613 |  |  | 5,182 |  |  | 14,292 |  |  | — |
Natural gas transmission and distribution | 12-80 |  | 8,808 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,719 |  |  | — |  |  | 6,089 |
Other buildings and improvements | 24-90 |  | 1,966 |  |  | 681 |  |  | 636 |  |  | 295 |  |  | 341 |  |  | 270 |  |  | 253 |  |  | 126 |
Plant – Nonregulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 5-30 |  | 4,410 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other buildings and improvements | 25-35 |  | 494 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Nuclear fuel |  |  | 3,460 |  |  | 1,898 |  |  | 1,562 |  |  | 1,562 |  |  | — |  |  | — |  |  | — |  |  | — |
Equipment | 3-55 |  | 2,141 |  |  | 467 |  |  | 565 |  |  | 399 |  |  | 166 |  |  | 384 |  |  | 178 |  |  | 141 |
Construction in process |  |  | 5,726 |  |  | 1,678 |  |  | 2,515 |  |  | 1,659 |  |  | 856 |  |  | 412 |  |  | 325 |  |  | 382 |
Other | 3-40 |  | 4,675 |  |  | 1,077 |  |  | 1,354 |  |  | 952 |  |  | 393 |  |  | 257 |  |  | 279 |  |  | 300 |
Total property, plant and equipment(a)(d) |  |  | 134,458 |  |  | 44,741 |  |  | 50,260 |  |  | 31,459 |  |  | 18,792 |  |  | 9,360 |  |  | 15,443 |  |  | 7,486 |
Total accumulated depreciation – regulated(b)(c)(d) |  |  | (41,079 | ) |  | (15,496 | ) |  | (16,398 | ) |  | (11,423 | ) |  | (4,968 | ) |  | (2,717 | ) |  | (4,914 | ) |  | (1,575 | )
Total accumulated depreciation – nonregulated(c)(d) |  |  | (2,047 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Generation facilities to be retired, net |  |  | 362 |  |  | — |  |  | 362 |  |  | 362 |  |  | — |  |  | — |  |  | — |  |  | — |
Total net property, plant and equipment |  |  | $ | 91,694 |  |  | $ | 29,245 |  |  | $ | 34,224 |  |  | $ | 20,398 |  |  | $ | 13,824 |  |  | $ | 6,643 |  |  | $ | 10,529 |  |  | $ | 5,911 |
(a) | Includes capitalized leases of $1,237 million, $135 million, $257 million, $137 million, $120 million, $73 million and $35 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $131 million, $14 million and $117 million, respectively, of accumulated amortization of capitalized leases.
(b) | Includes $1,947 million, $1,087 million, $860 million and $860 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c) | Includes accumulated amortization of capitalized leases of $61 million, $12 million, $20 million and $10 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(d) | Includes gross property, plant and equipment cost of consolidated VIEs of $4,007 million and accumulated depreciation of consolidated VIEs of $698 million at Duke Energy.
| December 31, 2017
| Estimated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Useful |  |  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Life |  | Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | (Years) |  | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont
Land |  |  | $ | 1,559 |  |  | $ | 467 |  |  | $ | 767 |  |  | $ | 424 |  |  | $ | 343 |  |  | $ | 134 |  |  | $ | 111 |  |  | $ | 41 |
Plant – Regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 8-100 |  | 93,687 |  |  | 35,657 |  |  | 39,419 |  |  | 24,502 |  |  | 14,917 |  |  | 4,870 |  |  | 13,741 |  |  | — |
Natural gas transmission and distribution | 12-80 |  | 8,292 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,559 |  |  | — |  |  | 5,733 |
Other buildings and improvements | 15-100 |  | 1,936 |  |  | 647 |  |  | 652 |  |  | 316 |  |  | 336 |  |  | 243 |  |  | 240 |  |  | 154 |
Plant – Nonregulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission(a) | 5-30 |  | 4,273 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other buildings and improvements | 25-35 |  | 465 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Nuclear fuel |  |  | 3,680 |  |  | 2,120 |  |  | 1,560 |  |  | 1,560 |  |  | — |  |  | — |  |  | — |  |  | — |
Equipment | 3-55 |  | 2,122 |  |  | 402 |  |  | 555 |  |  | 416 |  |  | 139 |  |  | 348 |  |  | 169 |  |  | 266 |
Construction in process |  |  | 6,995 |  |  | 2,614 |  |  | 3,059 |  |  | 1,434 |  |  | 1,625 |  |  | 350 |  |  | 416 |  |  | 231 |
Other | 3-40 |  | 4,498 |  |  | 1,032 |  |  | 1,311 |  |  | 931 |  |  | 370 |  |  | 228 |  |  | 271 |  |  | 300 |
Total property, plant and equipment(b)(e) |  |  | 127,507 |  |  | 42,939 |  |  | 47,323 |  |  | 29,583 |  |  | 17,730 |  |  | 8,732 |  |  | 14,948 |  |  | 6,725 |
Total accumulated depreciation – regulated(c)(d)(e) |  |  | (39,742 | ) |  | (15,063 | ) |  | (15,857 | ) |  | (10,903 | ) |  | (4,947 | ) |  | (2,691 | ) |  | (4,662 | ) |  | (1,479 | )
Total accumulated depreciation – nonregulated(d)(e) |  |  | (1,795 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Generation facilities to be retired, net |  |  | 421 |  |  | — |  |  | 421 |  |  | 421 |  |  | — |  |  | — |  |  | — |  |  | — |
Total net property, plant and equipment |  |  | $ | 86,391 |  |  | $ | 27,876 |  |  | $ | 31,887 |  |  | $ | 19,101 |  |  | $ | 12,783 |  |  | $ | 6,041 |  |  | $ | 10,286 |  |  | $ | 5,246 |
(a) | Includes a pretax impairment charge of $58 million on a wholly owned non-contracted wind project. See discussion below.
(b) | Includes capitalized leases of $1,294 million, $81 million, $272 million, $139 million, $133 million, $80 million and $35 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $114 million, $11 million and $103 million, respectively, of accumulated amortization of capitalized leases.
(c) | Includes $2,113 million, $1,283 million, $831 million and $831 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(d) | Includes accumulated amortization of capitalized leases of $57 million, $11 million, $21 million and $9 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(e) | Includes gross property, plant and equipment cost of consolidated VIEs of $3,941 million and accumulated depreciation of consolidated VIEs of $598 million at Duke Energy.
Schedule of Excise Taxes | Excise taxes accounted for on a gross basis within both Operating Revenues and Property and other taxes in the Consolidated Statements of Operations were as follows.
| Years Ended December 31,
(in millions) | 2018 |  |  | 2017 |  |  | 2016 |
Duke Energy | $ | 405 |  |  | $ | 376 |  |  | $ | 362 |
Duke Energy Carolinas | 35 |  |  | 36 |  |  | 31 |
Progress Energy | 241 |  |  | 220 |  |  | 213 |
Duke Energy Progress | 19 |  |  | 19 |  |  | 18 |
Duke Energy Florida | 222 |  |  | 201 |  |  | 195 |
Duke Energy Ohio | 105 |  |  | 98 |  |  | 100 |
Duke Energy Indiana | 22 |  |  | 20 |  |  | 17 |
Piedmont(a) | 2 |  |  | 2 |  |  |
(a) | Piedmont's excise taxes were immaterial for the two months ended December 31, 2016, and $2 million for the year ended October 31, 2016.
Summary of Practical Expedients for New Accounting Pronouncements | Duke Energy expects to adopt the following practical expedients:
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 plans to elect this practical expedient for all asset classes.
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 plans to elect this practical expedient for all asset classes.
Duke Energy currently expects to record right-of-use assets and operating lease liabilities on its balance sheet as shown in approximate amounts in the table below:
| (in millions) |
Duke Energy | $ | 1,700 |
Duke Energy Carolinas | 150 |
Progress Energy | 850 |
Duke Energy Progress | 400 |
Duke Energy Florida | 450 |
Duke Energy Ohio | 25 |
Duke Energy Indiana | 60 |
Piedmont | 30 |

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