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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated other comprehensive (income) loss
Net amount recognized in accumulated other comprehensive income	[1]	$ (13)	$ (8)	$ 1
Pension Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(202)	147
Accumulated other comprehensive (income) loss
Deferred income tax benefit		3	3
Amortization of prior year service credit			1
Amortization of prior year service credit		(17)	(12)
Net amount recognized in accumulated other comprehensive income		(14)	(8)
Pension Plan | Duke Energy Carolinas
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(46)	39
Pension Plan | Progress Energy
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(84)	33
Accumulated other comprehensive (income) loss
Amortization of prior year service credit		(1)	1
Net amount recognized in accumulated other comprehensive income		(1)	1
Pension Plan | Duke Energy Progress
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(40)	1
Pension Plan | Duke Energy Florida
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(43)	31
Pension Plan | Duke Energy Ohio
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(8)	11
Pension Plan | Duke Energy Indiana
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(6)	6
Accumulated other comprehensive (income) loss
Amortization of prior year service credit			(2)
Net amount recognized in accumulated other comprehensive income			(2)
Pension Plan | Piedmont
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(9)	16
Other Post-Retirement Benefit Plans
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(11)	(42)
Regulatory liabilities, net (decrease) increase		(30)	(76)
Accumulated other comprehensive (income) loss
Amortization of prior year actuarial gain		(1)	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 (decrease) increase		(17)	(62)
Regulatory liabilities, net (decrease) increase		(17)	(71)
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		7	23
Regulatory liabilities, net (decrease) increase		(1)	12
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		2	17
Regulatory liabilities, net (decrease) increase		(1)	12
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		5	5
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase			(1)
Regulatory liabilities, net (decrease) increase		(1)	(3)
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(3)	(3)
Regulatory liabilities, net (decrease) increase		(9)	$ (12)
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net (decrease) increase		(1)
Regulatory liabilities, net (decrease) increase		$ 1
[1] Net of income tax benefit of approximately $9 million for the year ended December 31, 2025, and net of income tax expense of approximately $70 million and $40 million for the years ended December 31, 2024, and 2023, respectively.

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The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet.

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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