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Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | $ 1,918 | $ 2,005
Other, current assets | 1,267 | 1,049
Regulatory assets, noncurrent | 13,393 | 13,617
Property, plant and equipment, cost | 141,363 | 134,458
Accumulated depreciation and amortization | (44,482) | (43,126)
Other noncurrent assets | 2,975 | 2,935
Current Liabilities: Other | 2,020 | 2,085
Current maturities of long-term debt | 2,698 | 3,406
Long-Term Debt | 54,342 | 51,123
Other Noncurrent Liabilities: Asset Retirement Obligations | 11,889 | 9,548
Other Noncurrent Liabilities: Other | 1,583 | 1,650
Duke Energy Carolinas [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 605 | 520
Other, current assets | 17 | 72
Regulatory assets, noncurrent | 3,392 | 3,457
Property, plant and equipment, cost | 47,249 | 44,741
Accumulated depreciation and amortization | (16,047) | (15,496)
Other noncurrent assets | 1,085 | 1,027
Current Liabilities: Other | 499 | 571
Current maturities of long-term debt | 456 | 6
Long-Term Debt | 10,208 | 10,633
Other Noncurrent Liabilities: Asset Retirement Obligations | 5,139 | 3,659
Other Noncurrent Liabilities: Other | 645 | 671
Duke Energy Progress [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 572 | 703
Other, current assets | 34 | 62
Regulatory assets, noncurrent | 4,124 | 4,111
Property, plant and equipment, cost | 33,288 | 31,459
Accumulated depreciation and amortization | (11,728) | (11,423)
Other noncurrent assets | 586 | 612
Current Liabilities: Other | 395 | 408
Current maturities of long-term debt | 6 | 603
Long-Term Debt | 8,893 | 7,451
Other Noncurrent Liabilities: Asset Retirement Obligations | 5,203 | 4,311
Other Noncurrent Liabilities: Other | 91 | 106
Duke Energy Florida [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 452 | 434
Other, current assets | 46 | 46
Regulatory assets, noncurrent | 2,299 | 2,454
Property, plant and equipment, cost | 19,461 | 18,792
Accumulated depreciation and amortization | (5,073) | (4,968)
Other noncurrent assets | 311 | 311
Current Liabilities: Other | 461 | 406
Current maturities of long-term debt | 671 | 270
Long-Term Debt | 6,542 | 7,051
Other Noncurrent Liabilities: Asset Retirement Obligations | 574 | 586
Other Noncurrent Liabilities: Other | 104 | 93
DEFPF [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 8 | 5
Regulatory assets, current | 52 | 52
Other, current assets | 31 | 39
Regulatory assets, noncurrent | 1,019 | 1,041
Current Liabilities: Other | 10 | 10
Current maturities of long-term debt | 54 | 53
Long-Term Debt | 1,082 | 1,111
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 671 | 699
Long-Term Debt | 475 | 450
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 518 | 547
Long-Term Debt | 325 | 300
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 472 | 357
Long-Term Debt | 250 | 225
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 484 | 564
Long-Term Debt | 328 | 325
Commercial Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Other, current assets | 109 | 123
Property, plant and equipment, cost | 4,419 | 4,007
Accumulated depreciation and amortization | (769) | (698)
Other noncurrent assets | 289 | 261
Current maturities of long-term debt | 178 | 174
Long-Term Debt | 1,610 | 1,587
Other Noncurrent Liabilities: Asset Retirement Obligations | 108 | 106
Other Noncurrent Liabilities: Other | $ 222 | $ 212

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