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

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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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
	Jun. 18, 2018 USD ($)	Mar. 31, 2020 USD ($) plant claim	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees			$ 99
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC Plants with Ash Basins \| plant		15
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		$ 596		$ 604
Reinsurance retention policy, excess retention, amount reinsured		747
Probable insurance recoveries		$ 742		$ 742
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims \| Non-malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| claim		118
Asbestos-related injuries and damages reserves		$ 30
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims \| Malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| claim		51
Asbestos-related injuries and damages reserves		$ 17
Duke Energy Progress \| Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 100
Duke Energy Florida \| Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 203
Duke Energy and Duke Energy Carolinas \| ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables			$ 15