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Regulatory Matters (Duke Energy Carolinas and Duke Energy Progress) (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 27, 2021	Jan. 22, 2021	Dec. 31, 2020	Mar. 31, 2020
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				$ 2
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges				$ 2
Duke Energy Carolinas \| 15-year storm recovery bond
Public Utilities, General Disclosures [Line Items]
Facility term	20 years
CCR Settlement Agreement \| Duke Energy Carolinas and Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Recovery costs not sought		$ 1,000
Recovery costs amortization period		5 years
Equity return on deferred coal ash cost future cases		1.50%
CCR Settlement Agreement \| Duke Energy Carolinas and Duke Energy Progress \| NCUC
Public Utilities, General Disclosures [Line Items]
Public utilities, requested equity capital structure, percentage		48.00%
Public utilities, requested debt capital structure, percentage		52.00%
CCR Settlement Agreement \| Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 454
Reversal of regulated electric operating revenues			50
CCR Settlement Agreement \| Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			494
Reversal of regulated electric operating revenues			$ 102
2020 North Carolina Storm Securitization Filings \| Duke Energy Carolinas \| NCUC \| Storm costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets	$ 287
2020 North Carolina Storm Securitization Filings \| Duke Energy Progress \| NCUC \| Storm costs
Public Utilities, General Disclosures [Line Items]
Regulatory assets	$ 920