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Investments in Debt and Equity Securities (Tables)

12 Months Ended

Dec. 31, 2025

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

			December 31, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
NDTF
Cash and cash equivalents			$	—					$	—					$	175					$	—					$	—					$	139
Equity securities			6,041						14						8,519						5,753						61						8,233
Corporate debt securities			17						18						1,056						6						33						673
Municipal bonds			4						13						366						2						14						342
U.S. government bonds			31						39						2,487						3						84						1,806
Other debt securities			3						5						284						1						8						239
Total NDTF Investments			$	6,096					$	89					$	12,887					$	5,765					$	200					$	11,432
Other Investments
Cash and cash equivalents			$	—					$	—					$	53					$	—					$	—					$	47
Equity securities			57						—						139						39						4						160
Corporate debt securities			—						2						75						—						5						79
Municipal bonds			—						1						67						—						1						83
U.S. government bonds			—						4						59						—						5						59
Other debt securities			—						2						45						—						4						45
Total Other Investments			$	57					$	9					$	438					$	39					$	19					$	473
Total Investments			$	6,153					$	98					$	13,325					$	5,804					$	219					$	11,905

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2025, 2024 and 2023, were as follows.

			Years Ended December 31,
(in millions)			2025						2024						2023
FV-NI:
Realized gains			$	1,174					$	600					$	129
Realized losses			145						85						146
AFS:
Realized gains			67						28						44
Realized losses			77						67						140

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

			December 31, 2025
						Duke						Duke			Duke			Duke
			Duke			Energy			Progress			Energy			Energy			Energy
(in millions)			Energy			Carolinas			Energy			Progress			Florida			Indiana
Due in one year or less			$	108		$	15		$	92		$	17		$	75		$	1
Due after one through five years			1,130			564			501			473			28			8
Due after five through 10 years			955			513			395			378			17			6
Due after 10 years			2,246			1,257			880			830			50			14
Total			$	4,439		$	2,349		$	1,868		$	1,698		$	170		$	29

Duke Energy Carolinas

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

			December 31, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
NDTF
Cash and cash equivalents			$	—					$	—					$	92					$	—					$	—					$	62
Equity securities			3,533						10						4,896						3,386						33						4,751
Corporate debt securities			9						15						662						2						27						401
Municipal bonds			—						5						42						—						4						36
U.S. government bonds			16						26						1,403						—						50						991
Other debt securities			3						5						242						1						8						223
Total NDTF Investments			$	3,561					$	61					$	7,337					$	3,389					$	122					$	6,464

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2025, 2024 and 2023, were as follows.

			Years Ended December 31,
(in millions)			2025						2024						2023
FV-NI:
Realized gains			$	693					$	298					$	82
Realized losses			77						40						79
AFS:
Realized gains			51						14						22
Realized losses			57						40						65

Progress Energy

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

			December 31, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
NDTF
Cash and cash equivalents			$	—					$	—					$	83					$	—					$	—					$	77
Equity securities			2,508						4						3,623						2,367						28						3,482
Corporate debt securities			8						3						394						4						6						272
Municipal bonds			4						8						324						2						10						306
U.S. government bonds			15						13						1,084						3						34						815
Other debt securities			—						—						42						—						—						16
Total NDTF Investments			$	2,535					$	28					$	5,550					$	2,376					$	78					$	4,968
Other Investments
Cash and cash equivalents			$	—					$	—					$	34					$	—					$	—					$	23
Municipal bonds			—						—						24						—						—						24
Total Other Investments			$	—					$	—					$	58					$	—					$	—					$	47
Total Investments			$	2,535					$	28					$	5,608					$	2,376					$	78					$	5,015

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2025, 2024 and 2023, were as follows.

			Years Ended December 31,
(in millions)			2025						2024						2023
FV-NI:
Realized gains			$	481					$	302					$	47
Realized losses			68						45						67
AFS:
Realized gains			16						14						22
Realized losses			20						27						75

Duke Energy Progress

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

			December 31, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
NDTF
Cash and cash equivalents			$	—					$	—					$	71					$	—					$	—					$	54
Equity securities			2,380						4						3,485						2,256						28						3,362
Corporate debt securities			8						3						375						4						6						256
Municipal bonds			4						8						324						2						10						306
U.S. government bonds			14						10						958						3						26						645
Other debt securities			—						—						41						—						—						14
Total NDTF Investments			$	2,406					$	25					$	5,254					$	2,265					$	70					$	4,637
Other Investments
Cash and cash equivalents			$	—					$	—					$	24					$	—					$	—					$	16
Total Other Investments			$	—					$	—					$	24					$	—					$	—					$	16
Total Investments			$	2,406					$	25					$	5,278					$	2,265					$	70					$	4,653

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2025, 2024 and 2023, were as follows.

			Years Ended December 31,
(in millions)			2025						2024						2023
FV-NI:
Realized gains			$	478					$	288					$	44
Realized losses			67						44						66
AFS:
Realized gains			15						13						20
Realized losses			19						26						70

Duke Energy Florida

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

			December 31, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
NDTF
Cash and cash equivalents			$	—					$	—					$	12					$	—					$	—					$	23
Equity securities			128						—						138						111						—						120
Corporate debt securities			—						—						19						—						—						16
U.S. government bonds			1						3						126						—						8						170
Other debt securities			—						—						1						—						—						2
Total NDTF Investments(a)			$	129					$	3					$	296					$	111					$	8					$	331
Other Investments
Cash and cash equivalents			$	—					$	—					$	5					$	—					$	—					$	3
Municipal bonds			—						—						24						—						—						24
Total Other Investments			$	—					$	—					$	29					$	—					$	—					$	27
Total Investments			$	129					$	3					$	325					$	111					$	8					$	358

(a)    During the years ended December 31, 2025, and 2024, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Duke Energy Indiana

Investment [Line Items]

Summary of Investments in Debt and Equity Securities

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

			December 31, 2025																								December 31, 2024
			Gross						Gross																		Gross
			Unrealized						Unrealized																		Unrealized
			Holding						Holding						Estimated												Holding						Estimated
(in millions)			Gains						Losses						Fair Value												Losses						Fair Value
Investments
Cash and cash equivalents			$	—					$	—					$	—											$	—					$	1
Equity securities			6						—						53												4						89
Corporate debt securities			—						—						1												—						6
Municipal bonds			—						1						25												1						43
U.S. government bonds			—						—						3												—						7
Total Investments			$	6					$	1					$	82											$	5					$	146

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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