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

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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Period Type:	duration

- 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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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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 3: http://www.xbrl.org/2003/role/presentationRef
-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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, 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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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Debt and Credit Facilities Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 22, 2016	Sep. 30, 2016	Jun. 30, 2016	Aug. 03, 2016	Aug. 01, 2016
Debt Instrument [Line Items]
Debt issuances			$ 3,394
Piedmont Natural Gas [Member]
Debt Instrument [Line Items]
Facility size			4,900
Available capacity			3,200
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size			7,500
Available capacity			5,134
February 2016 Term Loan Facility [Member]
Debt Instrument [Line Items]
Facility size	$ 1,000
Debt Instrument, Term	6 months
Amount outstanding at period end			100
February 2016 Term Loan Facility [Member] \| Subsequent Event [Member] \| Piedmont Natural Gas [Member]
Debt Instrument [Line Items]
Facility size					$ 1,000
August 2016 Term Loan Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Facility size					1,500
Facility size at period end					100
Available capacity					1,400
Debt Instrument, Term		10 months
Expiration Period (in days)		90 days
August 2016 Term Loan Facility [Member] \| Subsequent Event [Member] \| Piedmont Natural Gas [Member]
Debt Instrument [Line Items]
Facility size					$ 1,000
Solar Facilities Financing [Member] \| Subsequent Event [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt issuances				$ 333
Solar Facilities Financing [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| 1.75% Secured Debt Maturing June 2034 [Member]
Debt Instrument [Line Items]
Debt issuances				$ 228
Interest rate				1.75%
Debt Instrument, Interest Rate, Increase (Decrease)		0.125%
Solar Facilities Financing [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| 1.75% Secured Debt Maturing June 2020 [Member]
Debt Instrument [Line Items]
Debt issuances				$ 105
Interest rate				1.75%
Debt Instrument, Interest Rate, Increase (Decrease)		0.125%
Duke Energy Progress [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size			1,000
Available capacity			589
Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Debt issuances			1,000
Duke Energy Carolinas [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility size			800
Available capacity			211
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
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
Swap [Member] \| Solar Facilities Financing [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| 1.75% Secured Debt Maturing June 2034 [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate				1.81%
Swap [Member] \| Solar Facilities Financing [Member] \| Subsequent Event [Member] \| Secured Debt [Member] \| 1.75% Secured Debt Maturing June 2020 [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate				1.38%