Minimum Master Credit Facility Balance Required to be maintained to meet obligations outlined in Plea Agreements

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Amount of cash distribution paid to unit-holder of limited liability company (LLC).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
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-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

+ Details

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Balance Type:	credit
Period Type:	instant

- 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

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Debt and Credit Facilities Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions			1 Months Ended	9 Months Ended
	Oct. 28, 2016	Feb. 22, 2016	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Aug. 01, 2016	Jun. 01, 2016
Debt Instrument [Line Items]
Debt issuances				$ 8,527
Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2034 [Member]
Debt Instrument [Line Items]
Debt issuances				$ 228
Interest rate				2.747%
Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2020 [Member]
Debt Instrument [Line Items]
Debt issuances				$ 105
Interest rate				2.747%
Piedmont Natural Gas [Member]
Debt Instrument [Line Items]
Facility size				$ 4,900		$ 4,900
Piedmont Natural Gas [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt issuances						3,750
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size				7,500
Available capacity				5,155
Term Loan Facility [Member]
Debt Instrument [Line Items]
Facility size		$ 1,000				1,500
Facility size at period end				850
Debt Instrument, Term		6 months
Term Loan Facility [Member] \| Piedmont Natural Gas [Member]
Debt Instrument [Line Items]
Facility size				1,500
Facility size at period end				750
Term Loan Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Facility size at period end	$ 1,500
Proceeds from Line of Credit	$ 650
Solar Facilities Financing [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt issuances						333
Solar Facilities Financing [Member] \| Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2034 [Member]
Debt Instrument [Line Items]
Debt issuances						228
Debt Instrument, Basis Spread on Variable Rate			1.75%
Debt Instrument, Interest Rate, Increase (Decrease)			0.125%
Solar Facilities Financing [Member] \| Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2020 [Member]
Debt Instrument [Line Items]
Debt issuances						$ 105
Debt Instrument, Basis Spread on Variable Rate			1.75%
Debt Instrument, Interest Rate, Increase (Decrease)			0.125%
Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Debt issuances				1,000
Distributions to parent				1,800	$ 401
Duke Energy Carolinas [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size				1,100
Available capacity				511
Duke Energy Progress [Member]
Debt Instrument [Line Items]
Debt issuances				450
Distributions to parent				301
Duke Energy Progress [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size				1,000
Available capacity				598
Duke Energy Florida [Member]
Debt Instrument [Line Items]
Debt issuances				1,894
Distributions to parent				774	$ 350
Duke Energy Florida [Member] \| DEFPF [Member]
Debt Instrument [Line Items]
Debt issuances				1,294
Duke Energy Florida [Member] \| Secured Debt [Member] \| DEFPF [Member]
Debt Instrument [Line Items]
Debt issuances							$ 1,294
Distributions to parent				649
Duke Energy Florida [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size				950
Available capacity				949
USDOJ [Member] \| Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Minimum Master Credit Facility Balance Required				250
USDOJ [Member] \| Duke Energy Progress [Member] \| North Carolina Ash Basins [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Minimum Master Credit Facility Balance Required				$ 250
Swap [Member] \| Solar Facilities Financing [Member] \| Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2034 [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate						1.81%
Swap [Member] \| Solar Facilities Financing [Member] \| Secured Debt [Member] \| August 2016 2.747% Secured Debt Maturing June 2020 [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate						1.38%