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Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | $ 2,072 | $ 1,559 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 4,675 | 4,498 |  |
Equipment |  | 2,141 | 2,122 |  |
Construction in process |  | 5,726 | 6,995 |  |
Total property, plant and equipment |  | 134,458 | 127,507 |  |
Generation facilities to be retired, net |  | 362 | 421 |  |
Total net property, plant and equipment |  | 91,694 | 86,391 |  |
Asset Impairment Charges |  | 402 | 282 | $ 18 |
Capitalized leases |  | 1,237 | 1,294 |  |
Accumulated amortization on capitalized leases |  | (61) | (57) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | $ 161 | $ 128 | 100 |
Commercial Renewables [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Asset Impairment Charges |  |  |  | 71 |
Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 3 years | 3 years |  |
Equipment, estimated useful life, years |  | 3 years | 3 years |  |
Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 40 years | 40 years |  |
Equipment, estimated useful life, years |  | 55 years | 55 years |  |
Nuclear Fuel [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Nuclear fuel |  | $ 3,460 | $ 3,680 |  |
Accumulated depreciation and amortization |  | (1,947) | (2,113) |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Total property, plant and equipment |  | 4,007 | 3,941 |  |
Accumulated depreciation and amortization |  | (698) | (598) |  |
Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (41,079) | (39,742) |  |
Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | $ 100,706 | $ 93,687 |  |
Regulated Operation [Member] | Electric Plant [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 15 years | 8 years |  |
Regulated Operation [Member] | Electric Plant [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 100 years | 100 years |  |
Regulated Operation [Member] | Natural Gas [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | $ 8,808 | $ 8,292 |  |
Regulated Operation [Member] | Natural Gas [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 12 years | 12 years |  |
Regulated Operation [Member] | Natural Gas [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 80 years | 80 years |  |
Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | $ 1,966 | $ 1,936 |  |
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 24 years | 15 years |  |
Regulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 90 years | 100 years |  |
Nonregulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | $ (2,047) | $ (1,795) |  |
Nonregulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | $ 4,410 | $ 4,273 |  |
Nonregulated Operation [Member] | Electric Plant [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 5 years | 5 years |  |
Nonregulated Operation [Member] | Electric Plant [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution, estimated useful life, in years |  | 30 years | 30 years |  |
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | $ 494 | $ 465 |  |
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Minimum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 25 years | 25 years |  |
Nonregulated Operation [Member] | Other Buildings And Improvements [Member] | Maximum [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Other, estimated useful life, in years |  | 35 years | 35 years |  |
Duke Energy Carolinas [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | $ 472 | $ 467 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 1,077 | 1,032 |  |
Equipment |  | 467 | 402 |  |
Construction in process |  | 1,678 | 2,614 |  |
Total property, plant and equipment |  | 44,741 | 42,939 |  |
Total net property, plant and equipment |  | 29,245 | 27,876 |  |
Asset Impairment Charges |  | 192 |  | 1 |
Capitalized leases |  | 135 | 81 |  |
Accumulated amortization on capitalized leases |  | (12) | (11) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 35 | 45 | 38 |
Duke Energy Carolinas [Member] | Nuclear Fuel [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Nuclear fuel |  | 1,898 | 2,120 |  |
Accumulated depreciation and amortization |  | (1,087) | (1,283) |  |
Duke Energy Carolinas [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (15,496) | (15,063) |  |
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 38,468 | 35,657 |  |
Duke Energy Carolinas [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 681 | 647 |  |
Progress Energy [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 868 | 767 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 1,354 | 1,311 |  |
Equipment |  | 565 | 555 |  |
Construction in process |  | 2,515 | 3,059 |  |
Total property, plant and equipment |  | 50,260 | 47,323 |  |
Generation facilities to be retired, net |  | 362 | 421 |  |
Total net property, plant and equipment |  | 34,224 | 31,887 |  |
Asset Impairment Charges |  | 87 | 156 | 7 |
Capitalized leases net of accumulated amortization |  | 257 | 272 |  |
Accumulated amortization on capitalized leases |  | (131) | (114) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 51 | 45 | 31 |
Progress Energy [Member] | Nuclear Fuel [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Nuclear fuel |  | 1,562 | 1,560 |  |
Accumulated depreciation and amortization |  | (860) | (831) |  |
Progress Energy [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (16,398) | (15,857) |  |
Progress Energy [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 42,760 | 39,419 |  |
Progress Energy [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 636 | 652 |  |
Duke Energy Progress [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 445 | 424 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 952 | 931 |  |
Equipment |  | 399 | 416 |  |
Construction in process |  | 1,659 | 1,434 |  |
Total property, plant and equipment |  | 31,459 | 29,583 |  |
Generation facilities to be retired, net |  | 362 | 421 |  |
Total net property, plant and equipment |  | 20,398 | 19,101 |  |
Asset Impairment Charges |  | 33 | 19 | 1 |
Capitalized leases net of accumulated amortization |  | 137 | 139 |  |
Accumulated amortization on capitalized leases |  | (14) | (11) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 26 | 21 | 17 |
Duke Energy Progress [Member] | Nuclear Fuel [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Nuclear fuel |  | 1,562 | 1,560 |  |
Accumulated depreciation and amortization |  | (860) | (831) |  |
Duke Energy Progress [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (11,423) | (10,903) |  |
Duke Energy Progress [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 26,147 | 24,502 |  |
Duke Energy Progress [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 295 | 316 |  |
Duke Energy Florida [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 423 | 343 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 393 | 370 |  |
Equipment |  | 166 | 139 |  |
Construction in process |  | 856 | 1,625 |  |
Total property, plant and equipment |  | 18,792 | 17,730 |  |
Total net property, plant and equipment |  | 13,824 | 12,783 |  |
Asset Impairment Charges |  | 54 | 138 | 6 |
Capitalized leases net of accumulated amortization |  | 120 | 133 |  |
Accumulated amortization on capitalized leases |  | (117) | (103) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 25 | 24 | 14 |
Duke Energy Florida [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (4,968) | (4,947) |  |
Duke Energy Florida [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 16,613 | 14,917 |  |
Duke Energy Florida [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 341 | 336 |  |
Duke Energy Ohio [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 136 | 134 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 257 | 228 |  |
Equipment |  | 384 | 348 |  |
Construction in process |  | 412 | 350 |  |
Total property, plant and equipment |  | 9,360 | 8,732 |  |
Total net property, plant and equipment |  | 6,643 | 6,041 |  |
Asset Impairment Charges |  |  | 1 |  |
Capitalized leases |  | 73 | 80 |  |
Accumulated amortization on capitalized leases |  | (20) | (21) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 17 | 10 | 8 |
Duke Energy Ohio [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (2,717) | (2,691) |  |
Duke Energy Ohio [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 5,182 | 4,870 |  |
Duke Energy Ohio [Member] | Regulated Operation [Member] | Natural Gas [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 2,719 | 2,559 |  |
Duke Energy Ohio [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 270 | 243 |  |
Duke Energy Indiana [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 116 | 111 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 279 | 271 |  |
Equipment |  | 178 | 169 |  |
Construction in process |  | 325 | 416 |  |
Total property, plant and equipment |  | 15,443 | 14,948 |  |
Total net property, plant and equipment |  | 10,529 | 10,286 |  |
Asset Impairment Charges |  | 30 | 18 | 8 |
Capitalized leases |  | 35 | 35 |  |
Accumulated amortization on capitalized leases |  | (10) | (9) |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest |  | 27 | 9 | 7 |
Duke Energy Indiana [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (4,914) | (4,662) |  |
Duke Energy Indiana [Member] | Regulated Operation [Member] | Electric Plant [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 14,292 | 13,741 |  |
Duke Energy Indiana [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 253 | 240 |  |
Piedmont Natural Gas [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Land |  | 448 | 41 |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | 300 | 300 |  |
Equipment |  | 141 | 266 |  |
Construction in process |  | 382 | 231 |  |
Total property, plant and equipment |  | 7,486 | 6,725 |  |
Total net property, plant and equipment |  | 5,911 | 5,246 |  |
Asset Impairment Charges |  |  | 7 |  |
Capitalized Interest Costs [Abstract] |  |  |  |  |
Capitalized interest | $ 12 | 17 |  | $ 12 | $ 2
Piedmont Natural Gas [Member] | Regulated Operation [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Accumulated depreciation and amortization |  | (1,575) | (1,479) |  |
Piedmont Natural Gas [Member] | Regulated Operation [Member] | Natural Gas [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Plant - transmission and distribution |  | 6,089 | 5,733 |  |
Piedmont Natural Gas [Member] | Regulated Operation [Member] | Other Buildings And Improvements [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment |  | $ 126 | 154 |  |
Property, Plant and Equipment [Member] | Commercial Renewables [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Net [Abstract] |  |  |  |  |
Asset Impairment Charges |  |  | $ 58 |  |

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