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Commitments and Contingencies (Narrative) (Details) $ in Millions		9 Months Ended
	Jun. 18, 2018 USD ($)	Sep. 30, 2020 USD ($) plant claim	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
ASU 2016-13 \| ACP
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees			$ 95
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		$ 578		$ 604
Reinsurance retention policy, excess retention, amount reinsured		714
Probable insurance recoveries		$ 704		$ 742
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims \| Non-malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| claim		159
Asbestos-related injuries and damages reserves		$ 41
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims \| Malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| claim		68
Asbestos-related injuries and damages reserves		$ 23
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
Other Noncurrent Liabilities \| ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees		4
ACP \| Other Current Liabilities \| ACP
Loss Contingencies [Line Items]
Guarantees of outstanding debt		$ 860