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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
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% of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2020, or 2019.
|  |  | December 31,
(in millions) | Location |  | 2020 |  | 2019
Duke Energy |  |  |  |  |
Other accrued liabilities | Current Liabilities |  | $ | 1,455 |  |  | $ | 604 |
Accrued compensation | Current Liabilities |  | 662 |  |  | 862 |
Duke Energy Carolinas |  |  |  |  |
Accrued compensation | Current Liabilities |  | $ | 213 |  |  | $ | 271 |
Other accrued liabilities | Current Liabilities |  | 178 |  |  | 147 |
Progress Energy |  |  |  |  |
Customer deposits | Current Liabilities |  | $ | 347 |  |  | $ | 354 |
Duke Energy Florida |  |  |  |  |
Customer deposits | Current Liabilities |  | $ | 203 |  |  | $ | 209 |
Duke Energy Ohio |  |  |  |  |
Gas Storage | Current Assets |  | $ | 21 |  |  | $ | — |
Duke Energy Indiana |  |  |  |  |
Income taxes receivable | Current Assets |  | $ | 9 |  |  | $ | 44 |
Noncontrolling Divestitures And Allocated Losses | The following table presents cash received for the sale of noncontrolling interest and allocated losses to noncontrolling interest for the years ended December 31, 2020, and 2019.
| December 31,
(in millions) | 2020 |  | 2019
Noncontrolling Interest Capital Contributions |  |  |
Cash received for the sale of noncontrolling interest to tax equity members | $ | 426 |  |  | $ | 428 |
Cash received for the sale of noncontrolling interest to pro rata share members | — |  |  | 415 |
Total Noncontrolling Interest Capital Contributions | $ | 426 |  |  | $ | 843 |
Noncontrolling Interest Allocation of Income |  |  |
Allocated losses to noncontrolling tax equity members utilizing the HLBV method | $ | 271 |  |  | $ | 165 |
Allocated losses to noncontrolling members based on pro rata shares of ownership | 24 |  |  | 12 |
Total Noncontrolling Interest Allocated Losses | $ | 295 |  |  | $ | 177 |
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, 2020 |  | December 31, 2019
|  |  | Duke |  |  |  | Duke
| Duke | Progress | Energy |  | Duke | Progress | Energy
| Energy | Energy | Florida |  | Energy | Energy | Florida
Current Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 259 |  | $ | 59 |  | $ | 11 |  |  | $ | 311 |  | $ | 48 |  | $ | 17 |
Other | 194 |  | 39 |  | 39 |  |  | 222 |  | 39 |  | 39 |
Other Noncurrent Assets |  |  |  |  |  |  |
Other | 103 |  | 102 |  | — |  |  | 40 |  | 39 |  | — |
Total cash, cash equivalents and restricted cash | $ | 556 |  | $ | 200 |  | $ | 50 |  |  | $ | 573 |  | $ | 126 |  | $ | 56 |
Components of Inventory | The components of inventory are presented in the tables below.
| December 31, 2020
|  |  | 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 | $ | 2,312 |  |  | $ | 785 |  |  | $ | 999 |  |  | $ | 673 |  |  | $ | 325 |  |  | $ | 78 |  |  | $ | 307 |  |  | $ | 12 |
Coal | 561 |  |  | 186 |  |  | 193 |  |  | 131 |  |  | 63 |  |  | 16 |  |  | 165 |  |  | — |
Natural gas, oil and other | 294 |  |  | 39 |  |  | 183 |  |  | 107 |  |  | 76 |  |  | 16 |  |  | 1 |  |  | 56 |
Total inventory | $ | 3,167 |  |  | $ | 1,010 |  |  | $ | 1,375 |  |  | $ | 911 |  |  | $ | 464 |  |  | $ | 110 |  |  | $ | 473 |  |  | $ | 68 |
| December 31, 2019
|  |  | 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 | $ | 2,297 |  |  | $ | 768 |  |  | $ | 1,038 |  |  | $ | 686 |  |  | $ | 351 |  |  | $ | 79 |  |  | $ | 318 |  |  | $ | 5 |
Coal | 586 |  |  | 187 |  |  | 186 |  |  | 138 |  |  | 48 |  |  | 15 |  |  | 198 |  |  | — |
Natural gas, oil and other | 349 |  |  | 41 |  |  | 199 |  |  | 110 |  |  | 90 |  |  | 41 |  |  | 1 |  |  | 67 |
Total inventory | $ | 3,232 |  |  | $ | 996 |  |  | $ | 1,423 |  |  | $ | 934 |  |  | $ | 489 |  |  | $ | 135 |  |  | $ | 517 |  |  | $ | 72 |
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,
| 2020 |  | 2019 |  | 2018
Duke Energy | 3.0 | % |  | 3.1 | % |  | 3.0 | %
Duke Energy Carolinas | 2.8 | % |  | 2.8 | % |  | 2.8 | %
Progress Energy | 3.2 | % |  | 3.1 | % |  | 2.9 | %
Duke Energy Progress | 3.1 | % |  | 3.1 | % |  | 2.9 | %
Duke Energy Florida | 3.3 | % |  | 3.1 | % |  | 3.0 | %
Duke Energy Ohio | 2.9 | % |  | 2.6 | % |  | 2.8 | %
Duke Energy Indiana | 3.5 | % |  | 3.3 | % |  | 3.3 | %
Piedmont | 2.3 | % |  | 2.4 | % |  | 2.5 | %
The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.
| December 31, 2020
| Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Remaining |  |  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Useful Life |  | Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | (Years) |  | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Land |  |  | $ | 2,046 |  |  | $ | 536 |  |  | $ | 908 |  |  | $ | 463 |  |  | $ | 445 |  |  | $ | 171 |  |  | $ | 118 |  |  | $ | 279 |
Plant – Regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 39 |  | 117,107 |  |  | 44,059 |  |  | 50,785 |  |  | 31,375 |  |  | 19,410 |  |  | 6,255 |  |  | 16,008 |  |  | — |
Natural gas transmission and distribution | 54 |  | 10,799 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,136 |  |  | — |  |  | 7,663 |
Other buildings and improvements | 36 |  | 2,038 |  |  | 740 |  |  | 459 |  |  | 197 |  |  | 262 |  |  | 374 |  |  | 300 |  |  | 165 |
Plant – Nonregulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 27 |  | 5,444 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other buildings and improvements | 10 |  | 519 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Nuclear fuel |  |  | 3,284 |  |  | 1,837 |  |  | 1,447 |  |  | 1,447 |  |  | — |  |  | — |  |  | — |  |  | — |
Equipment | 15 |  | 2,608 |  |  | 620 |  |  | 759 |  |  | 498 |  |  | 261 |  |  | 385 |  |  | 238 |  |  | 122 |
Construction in process |  |  | 6,645 |  |  | 1,645 |  |  | 2,013 |  |  | 709 |  |  | 1,304 |  |  | 407 |  |  | 409 |  |  | 581 |
Other | 14 |  | 5,090 |  |  | 1,203 |  |  | 1,521 |  |  | 1,070 |  |  | 441 |  |  | 294 |  |  | 309 |  |  | 324 |
Total property, plant and equipment(a)(e) |  |  | 155,580 |  |  | 50,640 |  |  | 57,892 |  |  | 35,759 |  |  | 22,123 |  |  | 11,022 |  |  | 17,382 |  |  | 9,134 |
Total accumulated depreciation – regulated(b)(c) |  |  | (46,216) |  |  | (17,453) |  |  | (18,368) |  |  | (12,801) |  |  | (5,560) |  |  | (3,013) |  |  | (5,661) |  |  | (1,749) |
Total accumulated depreciation – nonregulated(d)(e) |  |  | (2,611) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Generation facilities to be retired, net |  |  | 29 |  |  | — |  |  | 29 |  |  | 29 |  |  | — |  |  | — |  |  | — |  |  | — |
Total net property, plant and equipment |  |  | $ | 106,782 |  |  | $ | 33,187 |  |  | $ | 39,553 |  |  | $ | 22,987 |  |  | $ | 16,563 |  |  | $ | 8,009 |  |  | $ | 11,721 |  |  | $ | 7,385 |
(a) Includes finance leases of $832 million, $335 million, $416 million, $297 million, $119 million and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $141 million, $24 million and $117 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,832 million, $1,010 million, $822 million and $822 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 finance leases of $12 million, $23 million and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of $23 million at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $6,394 million and accumulated depreciation of consolidated VIEs of $1,242 million at Duke Energy.
| December 31, 2019
| Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Remaining |  |  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Useful Life |  | Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | (Years) |  | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Land |  |  | $ | 2,091 |  |  | $ | 520 |  |  | $ | 884 |  |  | $ | 449 |  |  | $ | 435 |  |  | $ | 150 |  |  | $ | 117 |  |  | $ | 388 |
Plant – Regulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 39 |  | 111,739 |  |  | 42,723 |  |  | 48,142 |  |  | 30,018 |  |  | 18,124 |  |  | 5,838 |  |  | 15,032 |  |  | — |
Natural gas transmission and distribution | 54 |  | 9,839 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,892 |  |  | — |  |  | 6,947 |
Other buildings and improvements | 32 |  | 1,810 |  |  | 714 |  |  | 401 |  |  | 162 |  |  | 239 |  |  | 269 |  |  | 278 |  |  | 148 |
Plant – Nonregulated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generation, distribution and transmission | 28 |  | 5,103 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other buildings and improvements | 9 |  | 488 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Nuclear fuel |  |  | 3,253 |  |  | 1,891 |  |  | 1,362 |  |  | 1,362 |  |  | — |  |  | — |  |  | — |  |  | — |
Equipment | 13 |  | 2,313 |  |  | 546 |  |  | 665 |  |  | 452 |  |  | 213 |  |  | 319 |  |  | 205 |  |  | 128 |
Construction in process |  |  | 6,102 |  |  | 1,389 |  |  | 2,149 |  |  | 1,114 |  |  | 1,035 |  |  | 504 |  |  | 381 |  |  | 531 |
Other | 13 |  | 4,916 |  |  | 1,139 |  |  | 1,467 |  |  | 1,046 |  |  | 411 |  |  | 269 |  |  | 292 |  |  | 304 |
Total property, plant and equipment(a)(e) |  |  | 147,654 |  |  | 48,922 |  |  | 55,070 |  |  | 34,603 |  |  | 20,457 |  |  | 10,241 |  |  | 16,305 |  |  | 8,446 |
Total accumulated depreciation – regulated(b)(c) |  |  | (43,419) |  |  | (16,525) |  |  | (17,159) |  |  | (11,915) |  |  | (5,236) |  |  | (2,843) |  |  | (5,233) |  |  | (1,681) |
Total accumulated depreciation – nonregulated(d)(e) |  |  | (2,354) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Generation facilities to be retired, net |  |  | 246 |  |  | — |  |  | 246 |  |  | 246 |  |  | — |  |  | — |  |  | — |  |  | — |
Total net property, plant and equipment |  |  | $ | 102,127 |  |  | $ | 32,397 |  |  | $ | 38,157 |  |  | $ | 22,934 |  |  | $ | 15,221 |  |  | $ | 7,398 |  |  | $ | 11,072 |  |  | $ | 6,765 |
(a) Includes finance leases of $952 million, $211 million, $443 million, $308 million, $135 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $143 million, $17 million and $126 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,807 million, $1,082 million, $725 million and $725 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 finance leases of $6 million, $13 million, and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of $20 million at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $5,747 million and accumulated depreciation of consolidated VIEs of $1,041 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) | 2020 |  | 2019 |  | 2018
Duke Energy | $ | 415 |  |  | $ | 421 |  |  | $ | 405 |
Duke Energy Carolinas | 43 |  |  | 39 |  |  | 35 |
Progress Energy | 249 |  |  | 256 |  |  | 241 |
Duke Energy Progress | 26 |  |  | 21 |  |  | 19 |
Duke Energy Florida | 223 |  |  | 235 |  |  | 222 |
Duke Energy Ohio | 96 |  |  | 101 |  |  | 105 |
Duke Energy Indiana | 25 |  |  | 23 |  |  | 22 |
Piedmont | 2 |  |  | 2 |  |  | 2 |
Summary of Effects of New Accounting Pronouncements | Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below:
| December 31, 2020
|  |  | Duke |  |  |  | Duke |  | Duke |  |  |  |  |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  |  |  |  |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  |  |  |  |  | Piedmont
Total pretax impact to Retained Earnings | $ | 120 |  |  | $ | 16 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 1 |  |  |  |  |  |  | $ | 1 |

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