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Investments in Debt and Equity Securities (Tables)

12 Months Ended

Dec. 31, 2024

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, 2024																		December 31, 2023
			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			$	—					$	—					$	139					$	—					$	—					$	133
Equity securities			5,753						61						8,233						4,942						22						7,278
Corporate debt securities			6						33						673						12						43						632
Municipal bonds			2						14						342						6						16						347
U.S. government bonds			3						84						1,806						24						65						1,575
Other debt securities			1						8						239						1						13						178
Total NDTF Investments			$	5,765					$	200					$	11,432					$	4,985					$	159					$	10,143
Other Investments
Cash and cash equivalents			$	—					$	—					$	47					$	—					$	—					$	31
Equity securities			39						4						160						33						—						158
Corporate debt securities			—						5						79						—						6						82
Municipal bonds			—						1						83						1						2						77
U.S. government bonds			—						5						59						—						2						65
Other debt securities			—						4						45						—						2						47
Total Other Investments			$	39					$	19					$	473					$	34					$	12					$	460
Total Investments			$	5,804					$	219					$	11,905					$	5,019					$	171					$	10,603

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, 2024, 2023 and 2022, were as follows.

			Years Ended December 31,
(in millions)			2024						2023						2022
FV-NI:
Realized gains			$	600					$	129					$	201
Realized losses			85						146						316
AFS:
Realized gains			28						44						28
Realized losses			67						140						151

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

			December 31, 2024
						Duke						Duke			Duke			Duke
			Duke			Energy			Progress			Energy			Energy			Energy
(in millions)			Energy			Carolinas			Energy			Progress			Florida			Indiana
Due in one year or less			$	89		$	9		$	62		$	12		$	50		$	4
Due after one through five years			791			303			408			310			98			20
Due after five through 10 years			721			441			234			219			15			12
Due after 10 years			1,725			898			729			680			49			20
Total			$	3,326		$	1,651		$	1,433		$	1,221		$	212		$	56

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, 2024																		December 31, 2023
			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			$	—					$	—					$	62					$	—					$	—					$	51
Equity securities			3,386						33						4,751						2,886						14						4,196
Corporate debt securities			2						27						401						4						35						390
Municipal bonds			—						4						36						—						4						50
U.S. government bonds			—						50						991						13						33						826
Other debt securities			1						8						223						1						13						172
Total NDTF Investments			$	3,389					$	122					$	6,464					$	2,904					$	99					$	5,685

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, 2024, 2023 and 2022, were as follows.

			Years Ended December 31,
(in millions)			2024						2023						2022
FV-NI:
Realized gains			$	298					$	82					$	124
Realized losses			40						79						177
AFS:
Realized gains			14						22						22
Realized losses			40						65						86

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, 2024																		December 31, 2023
			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			$	—					$	—					$	77					$	—					$	—					$	82
Equity securities			2,367						28						3,482						2,056						8						3,082
Corporate debt securities			4						6						272						8						8						242
Municipal bonds			2						10						306						6						12						297
U.S. government bonds			3						34						815						11						32						749
Other debt securities			—						—						16						—						—						6
Total NDTF Investments			$	2,376					$	78					$	4,968					$	2,081					$	60					$	4,458
Other Investments
Cash and cash equivalents			$	—					$	—					$	23					$	—					$	—					$	18
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	47					$	—					$	1					$	41
Total Investments			$	2,376					$	78					$	5,015					$	2,081					$	61					$	4,499

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, 2024, 2023 and 2022, were as follows.

			Years Ended December 31,
(in millions)			2024						2023						2022
FV-NI:
Realized gains			$	302					$	47					$	77
Realized losses			45						67						139
AFS:
Realized gains			14						22						6
Realized losses			27						75						48

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, 2024																		December 31, 2023
			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			$	—					$	—					$	54					$	—					$	—					$	55
Equity securities			2,256						28						3,362						1,956						8						2,970
Corporate debt securities			4						6						256						7						8						229
Municipal bonds			2						10						306						6						12						297
U.S. government bonds			3						26						645						10						18						518
Other debt securities			—						—						14						—						—						6
Total NDTF Investments			$	2,265					$	70					$	4,637					$	1,979					$	46					$	4,075
Other Investments
Cash and cash equivalents			$	—					$	—					$	16					$	—					$	—					$	14
Total Other Investments			$	—					$	—					$	16					$	—					$	—					$	14
Total Investments			$	2,265					$	70					$	4,653					$	1,979					$	46					$	4,089

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, 2024, 2023 and 2022, were as follows.

			Years Ended December 31,
(in millions)			2024						2023						2022
FV-NI:
Realized gains			$	288					$	44					$	76
Realized losses			44						66						136
AFS:
Realized gains			13						20						6
Realized losses			26						70						44

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, 2024																		December 31, 2023
			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			$	—					$	—					$	23					$	—					$	—					$	27
Equity securities			111						—						120						100						—						112
Corporate debt securities			—						—						16						1						—						13
U.S. government bonds			—						8						170						1						14						231
Other debt securities			—						—						2						—						—						—
Total NDTF Investments(a)			$	111					$	8					$	331					$	102					$	14					$	383
Other Investments
Cash and cash equivalents			$	—					$	—					$	3					$	—					$	—					$	3
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	27					$	—					$	1					$	26
Total Investments			$	111					$	8					$	358					$	102					$	15					$	409

(a)    During the years ended December 31, 2024, and 2023, 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, 2024																		December 31, 2023
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized												Unrealized						Unrealized
			Holding						Holding						Estimated						Holding						Holding						Estimated
(in millions)			Gains						Losses						Fair Value						Gains						Losses						Fair Value
Investments
Cash and cash equivalents			$	—					$	—					$	1					$	—					$	—					$	1
Equity securities			—						4						89						4						—						98
Corporate debt securities			—						—						6						—						—						8
Municipal bonds			—						1						43						1						1						46
U.S. government bonds			—						—						7						—						—						10
Total Investments			$	—					$	5					$	146					$	5					$	1					$	163

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+ References

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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