Asset Impairment Charge Reversal

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- Definition

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

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- Definition

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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- Definition

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

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Pending Litigation, Damages Sought

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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.

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- Definition

Amount of loss contingency liability.

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Number of pending claims pertaining to a loss contingency.

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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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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		1 Months Ended	9 Months Ended
	Jun. 18, 2018 USD ($)	Sep. 30, 2019 USD ($) plant claim	Sep. 30, 2019 USD ($) plant claim	Dec. 31, 2018 USD ($)	Dec. 31, 2016 plant
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual		$ 62	$ 62	$ 65
Coal Ash Insurance Coverage Litigation [Member]
Valuation and Qualifying Accounts [Abstract]
Number of NC and SC plants with ash basins \| plant		15	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	$ 8	9
Duke Energy Carolinas [Member] \| Asbestos-related Injuries and Damages Claims [Member]
Valuation and Qualifying Accounts [Abstract]
Asbestos-related injuries and damages reserves		592	592	630
Reinsurance retention policy, excess retention, amount reinsured			747
Probable insurance recoveries		$ 722	$ 722	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		121	121
Asbestos-related injuries and damages reserves		$ 32	$ 32
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		40	40
Asbestos-related injuries and damages reserves		$ 13	$ 13
Progress Energy [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual		52	52	54
Duke Energy Progress [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual		13	13	12
Duke Energy Progress [Member] \| Spent Nuclear Fuel Matters [Member]
Valuation and Qualifying Accounts [Abstract]
Pending litigation, damages sought	$ 100
Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Loss contingency accrual		22	22	$ 24
Duke Energy Florida [Member] \| Spent Nuclear Fuel Matters [Member]
Valuation and Qualifying Accounts [Abstract]
Pending litigation, damages sought	$ 203
Fluor Letter Of Credit [Member] \| Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Drawings on credit facility			$ 67
Citrus County Station [Member] \| Duke Energy Florida [Member]
Valuation and Qualifying Accounts [Abstract]
Reversal of impairment charges		$ 25