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

No definition available.

Name:	duk_MinimumMasterCreditFacilityBalanceRequired
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	duk_OtherDebtMattersAbstract
Namespace Prefix:	duk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	duk_OtherLoansAbstract
Namespace Prefix:	duk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	duk_RestrictiveDebtCovenantsAbstract
Namespace Prefix:	duk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of subsidiary debt guaranteed by its parent.

+ References

No definition available.

+ Details

Name:	duk_SubsidiaryDebtGuaranteedByParent
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum amount of unsecured variable denomination floating rate demand notes available for sale.

+ References

No definition available.

+ Details

Name:	duk_UnsecuredVariableDenominationFloatingRateDemandNotesAmountAvailableForSale
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum amount of unsecured variable denomination floating rate demand notes that can be outstanding at any point in time.

+ References

No definition available.

+ Details

Name:	duk_UnsecuredVariableDenominationFloatingRateDemandNotesMaximumAmountOutstanding
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Principal amount of unsecured variable denomination floating rate demand notes that are outstanding at the balance sheet date.

+ References

No definition available.

+ Details

Name:	duk_UnsecuredVariableDenominationFloatingRateDemandNotesPrincipalAmountOutstanding
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Identification of each affiliate who is permitted to utilize the line of credit (for example, a subsidiary of the reporting entity) and description of its relationship to the reporting entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAffiliatedBorrower
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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

- 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://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: 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

Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20,22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Including the current and noncurrent portions, this element represents the carrying value of loans payable which were initially due after one year or beyond the operating cycle, if longer, and which are not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyCarolinasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyIndianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyOhioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyProgressMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_ProgressEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConsolidationItemsAxis=duk_ProceedsLoanedToSubsidiaryRegistrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt and Credit Facilities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2015	Mar. 31, 2015
Other Debt Matters [Abstract]
Subsidiary debt guaranteed by parent	$ 767,000,000duk_SubsidiaryDebtGuaranteedByParent	$ 811,000,000duk_SubsidiaryDebtGuaranteedByParent
Demand notes, maximum amount available for sale	3,000,000,000
Demand notes, maximum amount outstanding	1,500,000,000.0
Principal amount of demand notes	968,000,000	836,000,000
Other Loans [Abstract]
Other loans outstanding against cash surrender value of life insurance policies	603,000,000us-gaap_OtherLoansPayable	571,000,000us-gaap_OtherLoansPayable
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Line of Credit Facility [Abstract]
Facility size	6,000,000,000
Line of Credit Facility, Affiliated Borrower	The Duke Energy Registrants, excluding Progress Energy, each have borrowing capacity under the Master Credit Facility up to specified sublimits for each borrower. Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower.
Subsequent Event [Member]
Line of Credit Facility [Abstract]
Facility size			7,500,000,000.0
Duke Energy Carolinas [Member]
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Progress Energy [Member]
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Duke Energy Progress [Member]
Other Loans [Abstract]
Other loans outstanding against cash surrender value of life insurance policies	44,000,000	48,000,000
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Duke Energy Florida [Member]
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Duke Energy Ohio [Member]
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
Duke Energy Indiana [Member]
Restrictive Debt Covenants [Abstract]
Debt to total capitalization percentage, for each borrower	0.65
USDOJ [Member] \| Duke Energy Carolinas [Member] \| Subsequent Event [Member] \| North Carolina Ash Basins [Member]
Debt Instrument [Line Items]
Minimum Master Credit Facility Balance Required				250,000,000
USDOJ [Member] \| Duke Energy Progress [Member] \| Subsequent Event [Member] \| North Carolina Ash Basins [Member]
Debt Instrument [Line Items]
Minimum Master Credit Facility Balance Required				250,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	(2,021,000,000)
Line of Credit Facility [Abstract]
Facility size	6,000,000,000
Revolving Credit Facility [Member] \| Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	(300,000,000)
Line of Credit Facility [Abstract]
Facility size	1,000,000,000
Revolving Credit Facility [Member] \| Duke Energy Progress [Member]
Line of Credit Facility [Abstract]
Facility size	750,000,000
Revolving Credit Facility [Member] \| Duke Energy Florida [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	(29,000,000)
Line of Credit Facility [Abstract]
Facility size	650,000,000
Revolving Credit Facility [Member] \| Duke Energy Ohio [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	(38,000,000)
Line of Credit Facility [Abstract]
Facility size	650,000,000
Revolving Credit Facility [Member] \| Duke Energy Indiana [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	(175,000,000)
Line of Credit Facility [Abstract]
Facility size	700,000,000
Proceeds Loaned To Subsidiary Registrants [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Commercial Paper	$ (475,000,000)