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Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | $ 1,906 | $ 1,437
Other, current assets | 1,092 | 634
Regulatory assets, noncurrent | 12,616 | 12,442
Property, plant and equipment, cost | 132,677 | 127,507
Accumulated depreciation and amortization | (43,200) | (41,537)
Other noncurrent assets | 3,112 | 2,960
Current Liabilities: Other | 1,703 | 1,865
Current maturities of long-term debt | 3,455 | 3,244
Long-Term Debt | 50,507 | 49,035
Deferred income taxes | 7,765 | 6,621
Noncurrent Liabilities: Other | 1,477 | 1,581
Duke Energy Carolinas [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 435 | 299
Other, current assets | 55 | 19
Regulatory assets, noncurrent | 3,188 | 2,853
Property, plant and equipment, cost | 44,086 | 42,939
Accumulated depreciation and amortization | (15,536) | (15,063)
Other noncurrent assets | 1,009 | 979
Current Liabilities: Other | 419 | 486
Current maturities of long-term debt | 506 | 1,205
Long-Term Debt | 9,589 | 8,598
Deferred income taxes | 3,639 | 3,413
Noncurrent Liabilities: Other | 508 | 566
Duke Energy Progress [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 677 | 352
Other, current assets | 112 | 97
Regulatory assets, noncurrent | 3,822 | 3,507
Property, plant and equipment, cost | 31,091 | 29,583
Accumulated depreciation and amortization | (11,484) | (10,903)
Other noncurrent assets | 653 | 599
Current Liabilities: Other | 353 | 376
Current maturities of long-term debt | 603 | 3
Long-Term Debt | 7,401 | 7,204
Deferred income taxes | 2,076 | 1,883
Noncurrent Liabilities: Other | 48 | 45
Duke Energy Florida [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 445 | 389
Other, current assets | 27 | 86
Regulatory assets, noncurrent | 2,165 | 2,503
Property, plant and equipment, cost | 18,722 | 17,730
Accumulated depreciation and amortization | (5,161) | (4,947)
Other noncurrent assets | 315 | 284
Current Liabilities: Other | 315 | 334
Current maturities of long-term debt | 269 | 768
Long-Term Debt | 7,102 | 6,327
Deferred income taxes | 2,012 | 1,761
Noncurrent Liabilities: Other | 56 | 108
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 | 7 | 4
Regulatory assets, current | 52 | 51
Other, current assets | 14 | 40
Regulatory assets, noncurrent | 1,055 | 1,091
Current Liabilities: Other | 3 | 10
Current maturities of long-term debt | 53 | 53
Long-Term Debt | 1,111 | 1,164
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 | 795 | 640
Long-Term Debt | 450 | 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 | 635 | 459
Long-Term Debt | 300 | 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 | 456 | 317
Long-Term Debt | 225 | 225
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Receivables of VIEs | 504 | 545
Long-Term Debt | 325 | 325
Commercial Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Other, current assets | 203 | 174
Property, plant and equipment, cost | 4,025 | 3,923
Accumulated depreciation and amortization | (695) | (591)
Other noncurrent assets | 268 | 50
Current maturities of long-term debt | 175 | 170
Long-Term Debt | 1,604 | 1,700
Deferred income taxes |  | (148)
Noncurrent Liabilities: Other | $ 225 | $ 241

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