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Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entities [Line Items] |  |
Investments in equity method unconsolidated affiliates | $ 1,328 | $ 1,175
Other noncurrent assets | 3,112 | 2,960
Taxes accrued | 674 | 551
Current Liabilities: Other | 1,703 | 1,865
Deferred income taxes | 7,765 | 6,621
Noncurrent Liabilities: Other | 1,477 | 1,581
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Investments in equity method unconsolidated affiliates | 966 | 919
Other noncurrent assets |  | 17
Total assets | 966 | 936
Taxes accrued |  | (29)
Current Liabilities: Other | 3 | 4
Deferred income taxes | 14 | 42
Noncurrent Liabilities: Other | 11 | 12
Total liabilities | 28 | 29
Net assets | 938 | 907
Pipeline Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Investments in equity method unconsolidated affiliates | 729 | 697
Other noncurrent assets |  | 17
Total assets | 729 | 714
Taxes accrued |  | (29)
Deferred income taxes | 14 | 42
Total liabilities | 14 | 13
Net assets | 715 | 701
Commercial Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Investments in equity method unconsolidated affiliates | 190 | 180
Total assets | 190 | 180
Net assets | 190 | 180
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Investments in equity method unconsolidated affiliates | 47 | 42
Total assets | 47 | 42
Current Liabilities: Other | 3 | 4
Noncurrent Liabilities: Other | 11 | 12
Total liabilities | 14 | 16
Net assets | 33 | 26
Duke Energy Ohio [Member] |  |
Variable Interest Entities [Line Items] |  |
Receivables from affiliated companies | 71 | 133
Other noncurrent assets | 62 | 21
Taxes accrued | 159 | 190
Current Liabilities: Other | 67 | 71
Deferred income taxes | 790 | 781
Noncurrent Liabilities: Other | 113 | 108
Duke Energy Ohio [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Receivables from affiliated companies | 56 | 87
Total assets | 56 | 87
Net assets | 56 | 87
Duke Energy Indiana [Member] |  |
Variable Interest Entities [Line Items] |  |
Receivables from affiliated companies | 98 | 125
Other noncurrent assets | 233 | 189
Taxes accrued | 44 | 95
Current Liabilities: Other | 109 | 104
Deferred income taxes | 988 | 925
Noncurrent Liabilities: Other | 31 | 18
Duke Energy Indiana [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Receivables from affiliated companies | 94 | 106
Total assets | 94 | 106
Net assets | $ 94 | $ 106

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