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Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | $ 1,409 | $ 1,175 | $ 925
Investments and other assets | 2,935 | 2,960 |
Other current liabilities | 2,085 | 1,865 |
Deferred income taxes | 7,806 | 6,621 |
Other Liabilities | 1,650 | 1,581 |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 1,060 | 919 |
Investments and other assets |  | 17 |
Total assets | 1,060 | 936 |
Taxes accrued | (1) | (29) |
Other current liabilities | 4 | 4 |
Deferred income taxes | 21 | 42 |
Other Liabilities | 12 | 12 |
Total liabilities | 36 | 29 |
Net assets of non-consolidated VIEs | 1,024 | 907 |
Pipeline Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 822 | 697 |
Investments and other assets |  | 17 |
Total assets | 822 | 714 |
Taxes accrued | (1) | (29) |
Deferred income taxes | 21 | 42 |
Total liabilities | 20 | 13 |
Net assets of non-consolidated VIEs | 802 | 701 |
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 48 | 42 |
Total assets | 48 | 42 |
Other current liabilities | 4 | 4 |
Other Liabilities | 12 | 12 |
Total liabilities | 16 | 16 |
Net assets of non-consolidated VIEs | 32 | 26 |
Commercial Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in equity method unconsolidated affiliates | 190 | 180 |
Total assets | 190 | 180 |
Net assets of non-consolidated VIEs | 190 | 180 |
Duke Energy Ohio [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables from affiliated companies | 114 | 133 |
Investments and other assets | 41 | 21 |
Other current liabilities | 74 | 71 |
Deferred income taxes | 817 | 781 |
Other Liabilities | 93 | 108 |
Duke Energy Ohio [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables from affiliated companies | 93 | 87 |
Total assets | 93 | 87 |
Net assets of non-consolidated VIEs | 93 | 87 |
Duke Energy Indiana [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables from affiliated companies | 122 | 125 |
Investments and other assets | 194 | 189 |
Other current liabilities | 107 | 104 |
Deferred income taxes | 1,009 | 925 |
Other Liabilities | 16 | 18 |
Duke Energy Indiana [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables from affiliated companies | 118 | 106 |
Total assets | 118 | 106 |
Net assets of non-consolidated VIEs | $ 118 | $ 106 |

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