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Variable Interest Entities (Consolidated VIEs) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Variable Interest Entity Consolidated Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory Assets, Current | $ 2,005 | $ 1,437
Other current assets | 1,049 | 634
Property, plant and equipment, cost | 134,458 | 127,507
Accumulated depreciation and amortization | (43,126) | (41,537)
Regulatory assets, noncurrent | 13,617 | 12,442
Investments and other assets | 2,935 | 2,960
Current maturities of long-term debt | 3,406 | 3,244
Other current liabilities | 2,085 | 1,865
Long-Term debt | 51,123 | 49,035
Deferred income taxes | (7,806) | (6,621)
Asset retirement obligations | 9,548 | 9,486
Other Liabilities | 1,650 | 1,581
Duke Energy Carolinas [Member] |  |
Variable Interest Entity Consolidated Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory Assets, Current | 520 | 299
Other current assets | 72 | 19
Property, plant and equipment, cost | 44,741 | 42,939
Accumulated depreciation and amortization | (15,496) | (15,063)
Regulatory assets, noncurrent | 3,457 | 2,853
Investments and other assets | 1,027 | 979
Current maturities of long-term debt | 6 | 1,205
Other current liabilities | 571 | 486
Long-Term debt | 10,633 | 8,598
Deferred income taxes | (3,689) | (3,413)
Asset retirement obligations | 3,659 | 3,273
Other Liabilities | 671 | 566
Duke Energy Progress [Member] |  |
Variable Interest Entity Consolidated Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory Assets, Current | 703 | 352
Other current assets | 62 | 97
Property, plant and equipment, cost | 31,459 | 29,583
Accumulated depreciation and amortization | (11,423) | (10,903)
Regulatory assets, noncurrent | 4,111 | 3,507
Investments and other assets | 612 | 599
Current maturities of long-term debt | 603 | 3
Other current liabilities | 408 | 376
Long-Term debt | 7,451 | 7,204
Deferred income taxes | (2,119) | (1,883)
Asset retirement obligations | 4,311 | 4,378
Other Liabilities | 106 | 45
Duke Energy Florida [Member] |  |
Variable Interest Entity Consolidated Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory Assets, Current | 434 | 389
Other current assets | 46 | 86
Property, plant and equipment, cost | 18,792 | 17,730
Accumulated depreciation and amortization | (4,968) | (4,947)
Regulatory assets, noncurrent | 2,454 | 2,503
Investments and other assets | 311 | 284
Current maturities of long-term debt | 270 | 768
Other current liabilities | 406 | 334
Long-Term debt | 7,051 | 6,327
Deferred income taxes | (1,986) | (1,761)
Asset retirement obligations | 586 | 742
Other Liabilities | 93 | 108
DEFPF [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity Consolidated Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Restricted receivables of VIEs | 5 | 4
Regulatory Assets, Current | 52 | 51
Other current assets | 39 | 40
Regulatory assets, noncurrent | 1,041 | 1,091
Current maturities of long-term debt | 53 | 53
Other current liabilities | 10 | 10
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] |  |
Restricted receivables of VIEs | 699 | 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] |  |
Restricted receivables of VIEs | 547 | 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] |  |
Restricted receivables of VIEs | 357 | 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] |  |
Restricted receivables of VIEs | 564 | 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 | 123 | 174
Property, plant and equipment, cost | 4,007 | 3,923
Accumulated depreciation and amortization | (698) | (591)
Investments and other assets | 261 | 50
Current maturities of long-term debt | 174 | 170
Long-Term debt | 1,587 | 1,700
Deferred income taxes |  | (148)
Asset retirement obligations | 106 | 83
Other Liabilities | $ 212 | $ 241

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