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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Schedule of Current and Noncurrent Assets and Liabilities

The following table provides a description of amounts included in Other within Current Assets or Current Liabilities that exceed 5% of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2025, or 2024.

									December 31,
(in millions)			Location						2025						2024
Duke Energy Carolinas
Accrued compensation			Current Liabilities						$	302					$	234
Progress Energy
Customer deposits/Collateral liabilities			Current Liabilities						$	293					$	281
Duke Energy Progress
Accrued compensation			Current Liabilities						$	143					$	114
Duke Energy Florida
Tax receivables			Current Assets						$	12					$	166
Customer deposits/Collateral liabilities			Current Liabilities						191						164
Duke Energy Indiana
Customer advances			Current Liabilities						$	117					$	100

Schedule of Cash and Cash Equivalents

The following table presents the components of cash, cash equivalents and restricted cash included on the Consolidated Balance Sheets.

			December 31, 2025																		December 31, 2024
						Duke						Duke			Duke									Duke						Duke			Duke
			Duke			Energy			Progress			Energy			Energy						Duke			Energy			Progress			Energy			Energy
(in millions)			Energy			Carolinas			Energy			Progress			Florida						Energy			Carolinas			Energy			Progress			Florida
Current Assets
Cash and cash equivalents			$	245		$	3		$	54		$	16		$	21					$	314		$	6		$	73		$	24		$	33
Other			84			12			71			38			34						84			9			76			40			35
Other Noncurrent Assets
Other			34			7			14			7			7						20			1			11			5			7
Total cash, cash equivalents and restricted cash			$	363		$	22		$	139		$	61		$	62					$	418		$	16		$	160		$	69		$	75

Restrictions on Cash and Cash Equivalents

The following table presents the components of cash, cash equivalents and restricted cash included on the Consolidated Balance Sheets.

			December 31, 2025																		December 31, 2024
						Duke						Duke			Duke									Duke						Duke			Duke
			Duke			Energy			Progress			Energy			Energy						Duke			Energy			Progress			Energy			Energy
(in millions)			Energy			Carolinas			Energy			Progress			Florida						Energy			Carolinas			Energy			Progress			Florida
Current Assets
Cash and cash equivalents			$	245		$	3		$	54		$	16		$	21					$	314		$	6		$	73		$	24		$	33
Other			84			12			71			38			34						84			9			76			40			35
Other Noncurrent Assets
Other			34			7			14			7			7						20			1			11			5			7
Total cash, cash equivalents and restricted cash			$	363		$	22		$	139		$	61		$	62					$	418		$	16		$	160		$	69		$	75

Components of Inventory

The components of inventory are presented in the tables below.

			December 31, 2025
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Materials and supplies			$	3,542					$	1,157					$	1,789					$	1,109					$	680					$	155					$	398					$	10
Coal			715						328						235						155						80						21						131						—
Natural gas, oil and other			312						45						186						99						87						11						2						67
Total inventory			$	4,569					$	1,530					$	2,210					$	1,363					$	847					$	187					$	531					$	77

			December 31, 2024
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Materials and supplies			$	3,386					$	1,150					$	1,649					$	1,074					$	576					$	149					$	389					$	11
Coal			801						341						241						164						77						23						196						—
Natural gas, oil and other			309						45						196						103						92						11						1						55
Total inventory			$	4,496					$	1,536					$	2,086					$	1,341					$	745					$	183					$	586					$	66

Schedule of Property, Plant and Equipment

The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows.

			Years Ended December 31,
			2025						2024						2023
Duke Energy			3.1		%				3.0		%				2.9		%
Duke Energy Carolinas			3.1		%				3.1		%				2.7		%
Progress Energy			3.2		%				3.3		%				3.3		%
Duke Energy Progress			3.2		%				3.2		%				3.1		%
Duke Energy Florida			3.2		%				3.5		%				3.5		%
Duke Energy Ohio			2.9		%				2.9		%				2.8		%
Duke Energy Indiana			4.3		%				3.6		%				3.6		%
Piedmont			2.2		%				2.2		%				2.1		%

The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.

			December 31, 2025
			Average
			Remaining												Duke												Duke						Duke						Duke						Duke
			Useful Life						Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			(Years)						Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Land									$	2,667					$	644					$	1,226					$	557					$	669					$	289					$	157					$	326
Plant – Regulated
Electric generation, distribution and transmission			38						145,947						52,259						66,751						37,561						29,190						7,945						18,992						—
Natural gas transmission and distribution			58						14,201						—						—						—						—						4,529						—						9,672
Other buildings and improvements			40						3,214						1,280						854						423						431						437						381						262
Nuclear fuel									3,683						2,128						1,555						1,555						—						—						—						—
Equipment			11						4,193						1,132						1,456						852						604						555						540						131
Construction in process									10,075						3,708						4,390						2,761						1,629						394						884						408
Other			11						6,429						1,362						2,115						1,466						637						478						287						526
Total property, plant and equipment(a)									190,409						62,513						78,347						45,175						33,160						14,627						21,241						11,325
Total accumulated depreciation – regulated(b)(c)									(59,441)						(20,658)						(25,425)						(16,980)						(8,437)						(3,812)						(7,492)						(2,168)
Total accumulated depreciation – other(d)									(1,009)						—						—						—						—						—						—						—
Total net property, plant and equipment									$	129,959					$	41,855					$	52,922					$	28,195					$	24,723					$	10,815					$	13,749					$	9,157

(a)    Includes finance leases of $682 million, $349 million, $605 million, $478 million, $127 million and $13 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $208 million, $203 million and $5 million, respectively, of accumulated amortization of finance leases.

(b)    Includes $1,886 million, $1,064 million, $822 million and $822 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.

(c)    Includes accumulated amortization of finance leases of $98 million and $5 million at Duke Energy Carolinas and Duke Energy Indiana, respectively.

(d)    Includes accumulated amortization of finance leases of $35 million at Duke Energy.

			December 31, 2024
			Average
			Remaining												Duke												Duke						Duke						Duke						Duke
			Useful Life						Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			(Years)						Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Land									$	2,503					$	617					$	1,134					$	535					$	599					$	258					$	144					$	325
Plant – Regulated
Electric generation, distribution and transmission			37						137,836						49,547						62,351						35,633						26,718						7,634						18,304						—
Natural gas transmission and distribution			57						13,482						—						—						—						—						4,255						—						9,227
Other buildings and improvements			41						2,948						1,256						698						391						307						418						372						204
Nuclear fuel									3,518						2,003						1,515						1,515						—						—						—						—
Equipment			13						3,850						997						1,252						753						499						542						490						157
Construction in process									7,756						2,735						3,657						1,884						1,773						385						406						311
Other			10						6,844						1,227						1,953						1,349						594						426						254						488
Total property, plant and equipment(a)									178,737						58,382						72,560						42,060						30,490						13,918						19,970						10,712
Total accumulated depreciation – regulated(b)(c)									(55,143)						(19,090)						(23,586)						(15,930)						(7,650)						(3,674)						(6,848)						(2,041)
Total accumulated depreciation – other(d)									(1,968)						—						—						—						—						—						—						—
Total net property, plant and equipment									$	121,626					$	39,292					$	48,974					$	26,130					$	22,840					$	10,244					$	13,122					$	8,671

(a)    Includes finance leases of $670 million, $336 million, $620 million, $512 million, $108 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy and Duke Energy Progress amounts are net of $159 million of accumulated amortization of finance leases.

(b)    Includes $1,824 million, $1,010 million, $814 million and $814 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.

(c)    Includes accumulated amortization of finance leases of $84 million and $4 million at Duke Energy Carolinas and Duke Energy Indiana, respectively.

(d)    Includes accumulated amortization of finance leases of $25 million at Duke Energy.

Schedule of Accounts Payable and Supplier Invoices Sold

The following table presents the amounts included within Accounts payable on the Consolidated Balance Sheets sold to the financial institution by our suppliers and the supplier invoices sold to the financial institution under the program included within Net cash provided by operating activities on the Consolidated Statements of Cash Flows as of December 31, 2025, and December 31, 2024.

			For the Years Ended December 31, 2024 and 2025
			Duke
(in millions)			Energy																					Piedmont
Confirmed obligations outstanding at December 31, 2023			$	50																				$	47
Invoices confirmed during the period			156																					152
Confirmed invoices paid during the period			(193)																					(187)
Confirmed obligations outstanding at December 31, 2024			$	13																				$	12
Invoices confirmed during the period			71																					69
Confirmed invoices paid during the period			(61)																					(58)
Confirmed obligations outstanding at December 31, 2025			$	23																				$	23

Schedule of Excise Taxes

Excise taxes accounted for on a gross basis within both Operating Revenues and Property and other taxes on the Consolidated Statements of Operations were as follows.

			Years Ended December 31,
(in millions)			2025						2024						2023
Duke Energy			$	447					$	423					$	458
Duke Energy Carolinas			27						31						27
Progress Energy			307						285						322
Duke Energy Progress			8						9						5
Duke Energy Florida			299						276						317
Duke Energy Ohio			110						105						106
Duke Energy Indiana			—						—						1
Piedmont			3						2						2

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