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Variable Interest Entities (Sales and Cash Flows) (Details) - VIE, Not Primary Beneficiary - CRC - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Duke Energy Ohio |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables sold | $ 1,979 | $ 1,987 | $ 1,879
Loss recognized on sale | 14 | 13 | 10
Cash proceeds from receivables sold | 1,993 | 1,967 | 1,865
Collection fees received | 1 | 1 | 1
Return received on retained interests | 6 | 6 | 3
Duke Energy Indiana |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables sold | 2,837 | 2,842 | 2,711
Loss recognized on sale | 17 | 16 | 12
Cash proceeds from receivables sold | 2,860 | 2,815 | 2,694
Collection fees received | 1 | 1 | 1
Return received on retained interests | $ 9 | $ 9 | $ 7

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- Definition Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719 + Details
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- Definition Cash Flows between a transferee and a transferor attributable to servicing fees related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719 + Details
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- Definition Amount of gain (loss) on sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107425-111719 + Details
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- Definition Amount of cash inflow from collection on beneficial interest in securitization of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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