Basin water released, in gallons

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- Definition

Civil Penalty Assessed

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- Definition

The maximum per daily value (monetary amount) of the cival penalty the U.S. Department of Justice seeks for complaints and notices of violations under New Source Review (NSR) provisions of the Clean Air Act (CAA).

+ References

No definition available.

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- Definition

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

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- Definition

Number of Coal Plants with Projects Alleged to have Violated the New Source Review provisions of the Clean Air Act

+ References

No definition available.

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- Definition

Number of Retired Plants

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No definition available.

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- Definition

Obligation To Expand Generation Capacity, Percentage

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No definition available.

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- Definition

Projects with Alleged Violations of the New Source Review provisions of the Clean Air Act

+ References

No definition available.

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- Definition

Remaining Number of Coal Plants with projects Alleged to have violated the New Source Review provisions of the Clean Air Act

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No definition available.

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- Definition

Coal ash released, in tons

+ References

No definition available.

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Topic 410

-SubTopic 30

-Section 50

-Paragraph 12

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- Definition

The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 30

-Section 50

-Paragraph 1

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- Definition

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (a)

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- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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No definition available.

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- Definition

Amount of loss contingency liability.

+ References

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

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-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

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-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

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- Definition

The estimated maximum amount of possible loss from the contingency.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

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-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

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- Definition

Amount of receivable related to a loss contingency accrual that is expected to be collected after one year or beyond the normal operating cycle, if longer. For example, an insurance recovery receivable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 3

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- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

No definition available.

+ Details

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- Definition

Amount of risk reinsured in excess of stated retention per company policy.

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Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Feb. 02, 2014 T gal	Mar. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	331,000,000	$ 323,000,000
Brazil Expansion Lawsuit [Member]
Valuation and Qualifying Accounts [Abstract]
Obligation to expand installed generation capacity, percent	15.00%
Ash Basins Fines and Restitution [Member] \| USDOJ [Member]
Valuation and Qualifying Accounts [Abstract]
Litigation Settlement, Expense	68,000,000
Ash Basins Community Service and Mitigation [Member] \| USDOJ [Member]
Valuation and Qualifying Accounts [Abstract]
Litigation Settlement, Expense	34,000,000
Duke Energy Carolinas [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	72,000,000	72,000,000
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| USDOJ [Member]
Valuation and Qualifying Accounts [Abstract]
Minimum Master Credit Facility Balance Required	250,000,000
Loss Contingency Accrual	72,000,000
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Environmental remediation expense		24,000,000
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Minimum [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Coal ash released, in tons			30,000
Basin water released, in gallons			24,000,000
Duke Energy Carolinas [Member] \| North Carolina Ash Basins [Member] \| Maximum [Member] \| Dan River [Member]
Valuation and Qualifying Accounts [Abstract]
Coal ash released, in tons			39,000
Basin water released, in gallons			27,000,000
Duke Energy Carolinas [Member] \| New Source Review Provisions Of Clean Air Act [Member]
Valuation and Qualifying Accounts [Abstract]
Maximum civil penalties per day for each violation	37,500
Projects with Alleged NSR Violations	29
Number of Coal Plants with Alleged NSR Violations	25
Loss contingency, pending claims, number	13
Remaining Number of Coal Plants with Alleged NSR Violations	13
Number of Retired Plants	11
Duke Energy Carolinas [Member] \| Asbestos Issue [Member]
Valuation and Qualifying Accounts [Abstract]
Asbestos-related injuries and damages reserves	570,000,000	575,000,000
Reinsurance retention policy, amount retained	476,000,000
Reinsurance retention policy, excess retention, amount reinsured	864,000,000
Probable insurance recoveries	617,000,000	616,000,000
Duke Energy Carolinas [Member] \| Asbestos Issue [Member] \| Non Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number	121
Asbestos-related injuries and damages reserves	26,000,000
Duke Energy Carolinas [Member] \| Asbestos Issue [Member] \| Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number	32
Asbestos-related injuries and damages reserves	10,000,000
Progress Energy [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	93,000,000	93,000,000
Duke Energy Progress [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	37,000,000	37,000,000
Duke Energy Progress [Member] \| North Carolina Ash Basins [Member] \| USDOJ [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	30,000,000
Duke Energy Progress [Member] \| Groundwater Violation [Member] \| L V Sutton Plant [Member]
Valuation and Qualifying Accounts [Abstract]
Civil Penalty Assessed	25,000,000
Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	34,000,000	36,000,000
Duke Energy Florida [Member] \| Westinghouse Electric Company Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Gain contingency, unrecorded amount	54,000,000
Loss contingency, damages sought, value				510,000,000
Duke Energy Ohio [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency Accrual	10,000,000
Duke Energy Ohio [Member] \| Antitrust Lawsuit [Member]
Valuation and Qualifying Accounts [Abstract]
Loss Contingency, Range of Possible Loss, Maximum	500,000,000