Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated other comprehensive (income) loss
Net amount recognized in accumulated other comprehensive income	[1]	$ 1	$ 19	$ (7)
Progress Energy
Accumulated other comprehensive (income) loss
Net amount recognized in accumulated other comprehensive income		2	(5)	$ (1)
Pension Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		5	367
Accumulated other comprehensive (income) loss
Deferred income tax expense			(7)
Amortization of prior year service credit		(2)	37
Net amount recognized in accumulated other comprehensive income		(2)	30
Pension Plan | Duke Energy Carolinas
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(14)	221
Pension Plan | Progress Energy
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		8	107
Accumulated other comprehensive (income) loss
Deferred income tax expense			(1)
Amortization of prior year service credit			2
Net amount recognized in accumulated other comprehensive income			1
Pension Plan | Duke Energy Progress
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)			101
Pension Plan | Duke Energy Florida
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		9	5
Pension Plan | Duke Energy Ohio
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(3)	(1)
Pension Plan | Duke Energy Indiana
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(2)	(12)
Pension Plan | Piedmont
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		13	9
Other Post-Retirement Benefit Plans
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		73	(79)
Regulatory liabilities, net increase (decrease)		41	27
Accumulated other comprehensive (income) loss
Amortization of prior year service credit		1
Amortization of prior year actuarial gain			1
Net amount recognized in accumulated other comprehensive income		1	1
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		79
Regulatory liabilities, net increase (decrease)		62
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(7)	(80)
Accumulated other comprehensive (income) loss
Amortization of prior year actuarial gain		(1)
Net amount recognized in accumulated other comprehensive income		(1)
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(5)	(45)
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)			(36)
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(2)
Regulatory liabilities, net increase (decrease)		(4)
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		(2)	(3)
Regulatory liabilities, net increase (decrease)		(8)	19
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net increase (decrease)		$ 1
Regulatory liabilities, net increase (decrease)			$ (5)

[1] Net of income tax expense of approximately $40 million and $52 million for the years ended December 31, 2023, and 2022, respectively, and income tax benefit of $17 million for the year ended December 31, 2021.