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Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | $ 1,957 | $ 2,005
Other, current assets | 976 | 1,049
Regulatory assets, noncurrent | 13,301 | 13,617
Property, plant and equipment, cost | 139,377 | 134,458
Accumulated depreciation and amortization | (43,992) | (43,126)
Other noncurrent assets | 2,969 | 2,935
Current Liabilities: Other | 1,810 | 2,085
Current maturities of long-term debt | 2,501 | 3,406
Long-Term Debt | 53,681 | 51,123
Other Noncurrent Liabilities: Asset Retirement Obligations | 12,256 | 9,548
Other Noncurrent Liabilities: Other | 1,587 | 1,650
Duke Energy Carolinas [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 560 | 520
Other, current assets | 31 | 72
Regulatory assets, noncurrent | 3,429 | 3,457
Property, plant and equipment, cost | 46,929 | 44,741
Accumulated depreciation and amortization | (15,899) | (15,496)
Other noncurrent assets | 1,027 | 1,027
Current Liabilities: Other | 415 | 571
Current maturities of long-term debt | 7 | 6
Long-Term Debt | 10,658 | 10,633
Other Noncurrent Liabilities: Asset Retirement Obligations | 5,219 | 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 | 622 | 703
Other, current assets | 45 | 62
Regulatory assets, noncurrent | 4,041 | 4,111
Property, plant and equipment, cost | 33,188 | 31,459
Accumulated depreciation and amortization | (11,635) | (11,423)
Other noncurrent assets | 627 | 612
Current Liabilities: Other | 346 | 408
Current maturities of long-term debt | 5 | 603
Long-Term Debt | 8,893 | 7,451
Other Noncurrent Liabilities: Asset Retirement Obligations | 5,471 | 4,311
Other Noncurrent Liabilities: Other | 89 | 106
Duke Energy Florida [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Regulatory assets, current | 454 | 434
Other, current assets | 55 | 46
Regulatory assets, noncurrent | 2,316 | 2,454
Property, plant and equipment, cost | 19,111 | 18,792
Accumulated depreciation and amortization | (5,003) | (4,968)
Other noncurrent assets | 318 | 311
Current Liabilities: Other | 426 | 406
Current maturities of long-term debt | 470 | 270
Long-Term Debt | 6,795 | 7,051
Other Noncurrent Liabilities: Asset Retirement Obligations | 579 | 586
Other Noncurrent Liabilities: Other | 95 | 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 | 5 | 5
Regulatory assets, current | 52 | 52
Other, current assets | 12 | 39
Regulatory assets, noncurrent | 1,032 | 1,041
Current Liabilities: Other | 2 | 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 | 630 | 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 | 495 | 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 | 317 | 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 | 534 | 564
Long-Term Debt | 350 | 325
Commercial Renewables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] |  |
Other, current assets | 140 | 123
Property, plant and equipment, cost | 4,018 | 4,007
Accumulated depreciation and amortization | (733) | (698)
Other noncurrent assets | 280 | 261
Current maturities of long-term debt | 173 | 174
Long-Term Debt | 1,583 | 1,587
Other Noncurrent Liabilities: Asset Retirement Obligations | 107 | 106
Other Noncurrent Liabilities: Other | $ 212 | $ 212

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