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Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 6,115 | $ 6,628 | $ 5,643 | $ 6,135 | $ 5,799 | $ 6,482 | $ 5,555 | $ 5,729 | $ 24,521 | $ 23,565 | $ 22,743
Interest expense |  |  |  |  |  |  |  |  |  | 2,094 | 1,986 | 1,916
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 4,074 | 3,527 | 3,294
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 83 | 119 | (15)
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 448 | 1,196 | 1,156
Segment income (loss) |  |  |  |  |  |  |  |  |  | 2,647 | 3,065 | 2,571
Add back noncontrolling interests component |  |  |  |  |  |  |  |  |  | (22) | 5 | 7
Income (Loss) From Discontinued Operations, net of tax |  | 20 | 4 | (5) |  | (2) | (2) | (2) |  | 19 | (6) | (408)
Net income (loss) |  | 454 | 1,066 | 502 | 622 | 703 | 955 | 689 | 717 | 2,644 | 3,064 | 2,170
Net Income (Loss) Attributable to Parent |  | 464 | 1,082 | 500 | 620 | 703 | 954 | 686 | 716 | 2,666 | 3,059 | 2,152
Tax Act |  |  |  |  |  |  |  |  |  | 20 | (112) |
After-tax severance charges |  | 187 |  |  |  |  |  |  |  | 187 | 15 | 118
After-tax loss on sale and retirement |  |  |  |  | (107) |  |  |  |  | (107) |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 402 | 282 | 18
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 9,668 | 8,198 | 13,215
Segment assets |  | 145,392 |  |  |  | 137,914 |  |  |  | 145,392 | 137,914 | 132,761
Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 505 | 469 | 459 | 524 | 497 | 471 | 437 | 518 | 1,957 | 1,923 | 1,944
Interest expense |  |  |  |  |  |  |  |  |  | 92 | 91 | 86
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 268 | 261 | 233
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 43 | 59 | 78
Segment income (loss) |  |  |  |  |  |  |  |  |  | 176 | 193 | 192
Income (Loss) From Discontinued Operations, net of tax |  |  |  |  |  |  | (1) |  |  |  | (1) | 36
Net Income (Loss) Attributable to Parent |  | 55 | $ 100 | 46 | (25) | 65 | 55 | $ 30 | $ 42 | 176 | 192 | 228
Tax Act |  | 2 |  |  |  | (23) |  |  |  | 2 | (23) |
After-tax severance charges |  | 6 |  |  |  |  |  |  |  | 6 |  | 3
After-tax loss on sale and retirement |  |  |  |  | 107 |  |  |  |  | 107 |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 1 |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 827 | 686 | 476
Segment assets |  | 8,555 |  |  |  | 7,875 |  |  |  | 8,555 | 7,875 | 7,528
Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  | 20
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | 7 |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
International Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) From Discontinued Operations, net of tax |  |  |  |  |  |  |  |  |  |  |  | (534)
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  | 194
Regulatory settlements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory settlement charges |  |  |  | $ 179 | $ 86 | 23 | $ 135 |  |  | 265 | 158 |
Electric Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 22,242 | 21,300 | 21,336
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 6 | 5 | 5
Tax Act |  |  |  |  |  |  |  |  |  | 24 | 231 |
Electric Utilities and Infrastructure [Member] | Regulatory settlements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory settlement charges |  |  |  |  |  |  |  |  |  | 202 | 98 |
Electric Utilities and Infrastructure [Member] | After-tax impairment charge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges, net of tax |  |  |  |  |  |  |  |  |  | 46 |  |
Gas Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,783 | 1,743 | 875
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 27 | 62 | 19
Tax Act |  |  |  |  |  |  |  |  |  | 1 | 26 |
Gas Utilities and Infrastructure [Member] | Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Gas Utilities and Infrastructure [Member] | After-tax impairment charge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges, net of tax |  |  |  |  |  |  |  |  |  | 42 |  |
Commercial Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 477 | 460 | 484
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (1) | (5) | (82)
Tax Act |  |  |  |  |  |  |  |  |  | 3 | 442 |
Asset Impairment Charges, net of tax |  |  |  |  |  |  |  |  |  | 91 | 74 |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  |  | 71
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 19 | 62 | 48
Tax Act |  |  |  |  |  |  |  |  |  | 2 | 597 |
After-tax severance charges |  |  |  |  |  |  |  |  |  | 144 |  |
After-tax loss on sale and retirement |  |  |  |  |  |  |  |  |  | 82 |  |
Costs to achieve mergers, acquisition costs |  |  |  |  |  |  |  |  |  | 65 | 64 | 329
Cost Savings Initiative, Net of tax |  |  |  |  |  |  |  |  |  |  |  | 57
Other Segments [Member] | International Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  |  |  | 26
Total Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 24,502 | 23,503 | 22,695
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 22,273 | 21,331 | 21,366
Interest expense |  |  |  |  |  |  |  |  |  | 1,288 | 1,240 | 1,136
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,523 | 3,010 | 2,897
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 5 | 5 | 5
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 799 | 1,355 | 1,672
Segment income (loss) |  |  |  |  |  |  |  |  |  | 3,058 | 3,210 | 3,040
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 8,086 | 7,024 | 6,649
Segment assets |  | 125,364 |  |  |  | 119,423 |  |  |  | 125,364 | 119,423 | 114,993
Operating Segments [Member] | Electric Utilities and Infrastructure [Member] | Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,450 | 1,373 | 1,410
Interest expense |  |  |  |  |  |  |  |  |  | 67 | 62 | 58
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 183 | 178 | 151
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 47 | 40 | 55
Segment income (loss) |  |  |  |  |  |  |  |  |  | 186 | 138 | 154
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 655 | 491 | 322
Segment assets |  | 5,643 |  |  |  | 5,066 |  |  |  | 5,643 | 5,066 | 4,782
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,881 | 1,836 | 901
Interest expense |  |  |  |  |  |  |  |  |  | 106 | 105 | 46
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 245 | 231 | 115
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 27 | 62 | 19
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 78 | 116 | 90
Segment income (loss) |  |  |  |  |  |  |  |  |  | 274 | 319 | 152
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 1,133 | 907 | 5,519
Segment assets |  | 12,361 |  |  |  | 11,462 |  |  |  | 12,361 | 11,462 | 10,760
Operating Segments [Member] | Gas Utilities and Infrastructure [Member] | Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 506 | 508 | 503
Interest expense |  |  |  |  |  |  |  |  |  | 24 | 28 | 27
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 85 | 83 | 80
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 24 | 39 | 44
Segment income (loss) |  |  |  |  |  |  |  |  |  | 93 | 85 | 77
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 172 | 195 | 154
Segment assets |  | 2,874 |  |  |  | 2,758 |  |  |  | 2,874 | 2,758 | 2,696
Operating Segments [Member] | Commercial Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 477 | 460 | 484
Interest expense |  |  |  |  |  |  |  |  |  | 88 | 87 | 53
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 155 | 155 | 130
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | (1) | (5) | (82)
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | (147) | (628) | (160)
Segment income (loss) |  |  |  |  |  |  |  |  |  | 9 | 441 | 23
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 193 | 92 | 857
Segment assets |  | 4,204 |  |  |  | 4,156 |  |  |  | 4,204 | 4,156 | 4,377
Operating Segments [Member] | Total Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 24,631 | 23,627 | 22,751
Interest expense |  |  |  |  |  |  |  |  |  | 1,482 | 1,432 | 1,235
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,923 | 3,396 | 3,142
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 31 | 62 | (58)
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 730 | 843 | 1,602
Segment income (loss) |  |  |  |  |  |  |  |  |  | 3,341 | 3,970 | 3,215
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 9,412 | 8,023 | 13,025
Segment assets |  | 141,929 |  |  |  | 135,041 |  |  |  | 141,929 | 135,041 | 130,130
Operating Segments [Member] | Total Reportable Segments [Member] | Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,956 | 1,881 | 1,913
Interest expense |  |  |  |  |  |  |  |  |  | 91 | 90 | 85
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 268 | 261 | 231
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | 71 | 79 | 99
Segment income (loss) |  |  |  |  |  |  |  |  |  | 279 | 223 | 231
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 827 | 686 | 476
Segment assets |  | 8,517 |  |  |  | 7,824 |  |  |  | 8,517 | 7,824 | 7,478
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | (199) | (200) | (125)
Interest expense |  |  |  |  |  |  |  |  |  | (45) | (20) | (12)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (1) |  |
Segment income (loss) |  |  |  |  |  |  |  |  |  |  |  | 1
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Segment assets |  | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188
Intersegment Eliminations [Member] | Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Segment assets |  |  |  |  |  | (15) |  |  |  |  | (15) | (12)
Intersegment Eliminations [Member] | Electric Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 31 | 31 | 30
Intersegment Eliminations [Member] | Gas Utilities and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 98 | 93 | 26
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 70 | 76 | 69
Intersegment Eliminations [Member] | Total Reportable Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 129 | 124 | 56
Corporate, Non-Segment [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 89 | 138 | 117
Interest expense |  |  |  |  |  |  |  |  |  | 657 | 574 | 693
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 152 | 131 | 152
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  | 52 | 57 | 43
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | (282) | 353 | (446)
Segment income (loss) |  |  |  |  |  |  |  |  |  | (694) | (905) | (645)
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Capital investments, expenditures and acquisitions |  |  |  |  |  |  |  |  |  | 256 | 175 | 190
Segment assets |  | 3,275 |  |  |  | 2,685 |  |  |  | 3,275 | 2,685 | 2,443
Corporate, Non-Segment [Member] | Other Segments [Member] | Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1 | 42 | 31
Interest expense |  |  |  |  |  |  |  |  |  | 1 | 1 | 1
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 2
Income tax expense (benefit) from continuing operations |  |  |  |  |  |  |  |  |  | (28) | (20) | (21)
Segment income (loss) |  |  |  |  |  |  |  |  |  | (103) | (30) | (39)
Segment Reporting Information Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Segment assets |  | $ 38 |  |  |  | $ 66 |  |  |  | 38 | 66 | 62
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (22) | $ 5 | $ 18
Noncontrolling Interest [Member] | Commercial Renewables [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges, net of tax |  |  |  |  |  |  |  |  |  | $ 2 |  |

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- Definition Total expenditures for long-lived assets additions other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References No definition available. + Details
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