Number of NC Plants with Ash Basins requiring additional monitoring and assessment

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Number of NC and SC Plants with Ash Basins with insurance claims being sought

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Number of Plants with Disputed Facts

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Number of Plants with No Disputed Facts due to litigation being concluded

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Pending Litigation, Damages Sought

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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.

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Amount of loss contingency liability.

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Number of pending claims pertaining to a loss contingency.

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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.

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

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Commitments and Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) plant claim	Dec. 31, 2018 USD ($)	Dec. 31, 2016 plant
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual	$ 66	$ 65
Coal Ash Insurance Coverage Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Number of NC and SC plants with ash basins \| plant	15
NCDEQ State Enforcement Actions [Member]
Valuation and Qualifying Accounts [Abstract]
Number of plants with no disputed facts \| plant			7
Number of NC plants with ash basins \| plant			14
Number of plants with disputed facts \| plant			7
Duke Energy Carolinas [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual	$ 8	9
Duke Energy Carolinas [Member] \| Asbestos-related Injuries and Damages Claims [Member]
Valuation and Qualifying Accounts [Abstract]
Asbestos-related injuries and damages reserves	617	630
Reinsurance retention policy, excess retention, amount reinsured	764
Probable insurance recoveries	$ 739	739
Duke Energy Carolinas [Member] \| Asbestos-related Injuries and Damages Claims [Member] \| Non-Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number \| claim	139
Asbestos-related injuries and damages reserves	$ 34
Duke Energy Carolinas [Member] \| Asbestos-related Injuries and Damages Claims [Member] \| Malignant Asbestos Claim [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency, pending claims, number \| claim	57
Asbestos-related injuries and damages reserves	$ 18
Progress Energy [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual	57	54
Duke Energy Progress [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual	15	12
Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual	24	$ 24
Duke Energy Florida [Member] \| Fluor Contract Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Pending litigation, damages sought	110
Fluor Letter Of Credit [Member] \| Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Drawings on credit facility	$ 67