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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Revolving Credit Facility [Member] | Jun. 30, 2018 USD ($)
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Line of Credit Facility [Line Items] |
Facility size | $ 8,000,000,000
Commercial paper | (3,004,000,000)
Outstanding letters of credit | (57,000,000)
Tax exempt bonds | (81,000,000)
Coal ash set-aside | (500,000,000)
Available capacity | 4,358,000,000
Parent Company [Member] |
Line of Credit Facility [Line Items] |
Facility size | 2,650,000,000
Commercial paper | (1,087,000,000)
Outstanding letters of credit | (49,000,000)
Available capacity | 1,514,000,000
Duke Energy Carolinas [Member] |
Line of Credit Facility [Line Items] |
Facility size | 1,750,000,000
Commercial paper | (856,000,000)
Outstanding letters of credit | (4,000,000)
Coal ash set-aside | (250,000,000)
Available capacity | 640,000,000
Duke Energy Progress [Member] |
Line of Credit Facility [Line Items] |
Facility size | 1,250,000,000
Commercial paper | (556,000,000)
Outstanding letters of credit | (2,000,000)
Coal ash set-aside | (250,000,000)
Available capacity | 442,000,000
Duke Energy Florida [Member] |
Line of Credit Facility [Line Items] |
Facility size | 800,000,000
Available capacity | 800,000,000
Duke Energy Ohio [Member] |
Line of Credit Facility [Line Items] |
Facility size | 450,000,000
Commercial paper | (189,000,000)
Available capacity | 261,000,000
Duke Energy Indiana [Member] |
Line of Credit Facility [Line Items] |
Facility size | 600,000,000
Commercial paper | (316,000,000)
Tax exempt bonds | (81,000,000)
Available capacity | 203,000,000
Piedmont Natural Gas [Member] |
Line of Credit Facility [Line Items] |
Facility size | 500,000,000
Outstanding letters of credit | (2,000,000)
Available capacity | 498,000,000
Proceeds Loaned To Subsidiary Registrants [Member] | Parent Company [Member] |
Line of Credit Facility [Line Items] |
Commercial paper | $ (625,000,000)

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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