Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2009	Dec. 31, 2012
Insurance [Abstract]
Insured public liability limit per nuclear incident	$ 13,600,000,000
Primary nuclear liability program coverage	375,000,000
Excess nuclear liability program coverage	13,200,000,000
Pro rata assessment for each reactor owned for each incident exceeding public liability insurance	127,000,000
Annual payment limit to pro rata assessments	19,000,000
Industry aggregate limit	3,200,000,000
Sublimit for non-nuclear terrorist events	1,830,000,000
Number of licensed nuclear reactors	104
Primary property insurance coverage per nuclear facility	500,000,000
Sublimit property damage losses	1,500,000,000
Percentage of insurance coverage during initial weeks of covered event	100.00%
Initial weeks of insurance coverage	52
Percentage of insurance coverage during additional weeks of covered event	80.00%
Additional weeks of insurance coverage	110
Sublimit accidental outage recovery	328,000,000
Valuation and Qualifying Accounts [Abstract]
Probable insurance recoveries	649,000,000	[1],[2],[3]		781,000,000	[1],[2],[3]
Minimum [Member]
Valuation and Qualifying Accounts [Abstract]
Estimated cost of complying with recently issued and proposed EPA regulations	4,500,000,000
Estimated amount of ash released, in tons	30,000
Estimated amount of ash basin water released, in gallons	24,000,000
Maximum [Member]
Valuation and Qualifying Accounts [Abstract]
Estimated cost of complying with recently issued and proposed EPA regulations	5,500,000,000
Estimated amount of ash released, in tons	39,000
Estimated amount of ash basin water released, in gallons	27,000,000
Brazil Expansion Lawsuit [Member]
Valuation and Qualifying Accounts [Abstract]
Obligation to expand installed generation capacity, percent	15.00%
Crescent Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Loss related to litigation settlement	22,000,000
Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	74,000,000
Duke Energy Carolinas [Member]
Insurance [Abstract]
Primary property insurance deductible per occurrence obligation	10,000,000
Maximum potentional retroactive premium assessments for primary property insurance	42,000,000
Maximum potentional retroactive premium assessments for excess property insurance	36,000,000
Maximum potentional retroactive premium assessments for accidental outage insurance	29,000,000
Valuation and Qualifying Accounts [Abstract]
Probable insurance recoveries	649,000,000	[1],[2],[3]		781,000,000	[1],[2],[3]
Duke Energy Carolinas [Member] | McGuire Nuclear Station [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	750,000,000
Excess property, decontamination and decommissioning liability insurance additional shared limits	1,000,000,000
Accidental outage insurance coverage per week	4,000,000
Accidental outage insurance coverage policy limit	490,000,000
Duke Energy Carolinas [Member] | Oconee Nuclear Station [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	750,000,000
Excess property, decontamination and decommissioning liability insurance additional shared limits	1,000,000,000
Accidental outage insurance coverage per week	3,000,000
Accidental outage insurance coverage policy limit	378,000,000
Duke Energy Carolinas [Member] | Catawba Nuclear Station [Member]
Insurance [Abstract]
Primary property insurance deductible per occurrence obligation	3,000,000
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	2,250,000,000
Accidental outage insurance coverage per week	4,000,000
Accidental outage insurance coverage policy limit	490,000,000
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
Duke Energy Carolinas [Member] | Asbestos Issue [Member]
Valuation and Qualifying Accounts [Abstract]
Asbestos-related injuries and damages reserves	616,000,000			751,000,000
Reinsurance retention policy, amount retained	476,000,000
Reinsurance retention policy, excess retention, amount reinsured	897,000,000
Duke Energy Carolinas [Member] | Asbestos Issue [Member] | Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number	31
Asbestos-related injuries and damages reserves	11,000,000
Duke Energy Carolinas [Member] | Asbestos Issue [Member] | Non Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number	96
Asbestos-related injuries and damages reserves	24,000,000
Duke Energy Carolinas [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	29,000,000
Progress Energy [Member] | Synthetic Fuels [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, damages paid, value			154,000,000
Damages awarded to plaintiff	90,000,000
Gain recognized in period				63,000,000
Progress Energy [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	5,000,000
Duke Energy Progress [Member]
Insurance [Abstract]
Primary property insurance deductible per occurrence obligation	10,000,000
Maximum potentional retroactive premium assessments for primary property insurance	33,000,000
Maximum potentional retroactive premium assessments for excess property insurance	32,000,000
Maximum potentional retroactive premium assessments for accidental outage insurance	14,000,000
Duke Energy Progress [Member] | Robinson Nuclear Station [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	750,000,000
Excess property, decontamination and decommissioning liability insurance additional shared limits	1,000,000,000
Accidental outage insurance coverage per week	2,000,000
Accidental outage insurance coverage policy limit	308,000,000
Duke Energy Progress [Member] | Brunswick Nuclear Station [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	750,000,000
Excess property, decontamination and decommissioning liability insurance additional shared limits	1,000,000,000
Accidental outage insurance coverage per week	3,000,000
Accidental outage insurance coverage policy limit	406,000,000
Duke Energy Progress [Member] | Shearon Harris Nuclear Station [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	750,000,000
Excess property, decontamination and decommissioning liability insurance additional shared limits	1,000,000,000
Accidental outage insurance coverage per week	3,000,000
Accidental outage insurance coverage policy limit	364,000,000
Duke Energy Progress [Member] | Spent Nuclear Fuels [Member]
Valuation and Qualifying Accounts [Abstract]
Gain contingency, unrecorded amount	84,000,000
Duke Energy Progress [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	2,000,000
Duke Energy Florida [Member]
Insurance [Abstract]
Primary property insurance deductible per occurrence obligation	10,000,000
Maximum potentional retroactive premium assessments for primary property insurance	6,000,000
Maximum potentional retroactive premium assessments for excess property insurance	4,000,000
Duke Energy Florida [Member] | Crystal River Unit 3 [Member]
Insurance [Abstract]
Excess property, decontamination and decommissioning liability insurance limits on each nuclear plant	560,000,000
Duke Energy Florida [Member] | Spent Nuclear Fuels [Member]
Valuation and Qualifying Accounts [Abstract]
Gain contingency, unrecorded amount	21,000,000
Duke Energy Florida [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	3,000,000
Duke Energy Ohio [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	35,000,000
Duke Energy Indiana [Member] | Edwardsport IGCC Plant [Member]
Valuation and Qualifying Accounts [Abstract]
Gain contingency, unrecorded amount	560,000,000
Duke Energy Indiana [Member] | Environmental Reserves [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, range of possible loss, portion not acccrued	$ 5,000,000

[1] Classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.

[2] Classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.

[3] Relates to recoveries associated with asbestos-related injuries and damages claims.