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Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2025

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	172					$	—					$	—					$	139
Equity securities			5,938						17						8,435						5,753						61						8,233
Corporate debt securities			21						19						1,021						6						33						673
Municipal bonds			4						15						374						2						14						342
U.S. government bonds			32						43						2,488						3						84						1,806
Other debt securities			3						5						287						1						8						239
Total NDTF Investments			$	5,998					$	99					$	12,777					$	5,765					$	200					$	11,432
Other Investments
Cash and cash equivalents			$	—					$	—					$	76					$	—					$	—					$	47
Equity securities			54						—						134						39						4						160
Corporate debt securities			—						2						70						—						5						79
Municipal bonds			—						2						69						—						1						83
U.S. government bonds			—						4						56						—						5						59
Other debt securities			—						2						49						—						4						45
Total Other Investments			$	54					$	10					$	454					$	39					$	19					$	473
Total Investments			$	6,052					$	109					$	13,231					$	5,804					$	219					$	11,905

Debt Securities, Available-for-sale

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	172					$	—					$	—					$	139
Equity securities			5,938						17						8,435						5,753						61						8,233
Corporate debt securities			21						19						1,021						6						33						673
Municipal bonds			4						15						374						2						14						342
U.S. government bonds			32						43						2,488						3						84						1,806
Other debt securities			3						5						287						1						8						239
Total NDTF Investments			$	5,998					$	99					$	12,777					$	5,765					$	200					$	11,432
Other Investments
Cash and cash equivalents			$	—					$	—					$	76					$	—					$	—					$	47
Equity securities			54						—						134						39						4						160
Corporate debt securities			—						2						70						—						5						79
Municipal bonds			—						2						69						—						1						83
U.S. government bonds			—						4						56						—						5						59
Other debt securities			—						2						49						—						4						45
Total Other Investments			$	54					$	10					$	454					$	39					$	19					$	473
Total Investments			$	6,052					$	109					$	13,231					$	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 three and nine months ended September 30, 2025, and 2024, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
FV-NI:
Realized gains			$	848					$	61					$	1,015					$	256
Realized losses			21						19						102						64
AFS:
Realized gains			23						10						43						22
Realized losses			20						8						57						44

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

			September 30, 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			$	92					$	9					$	82					$	10					$	72					$	1
Due after one through five years			1,138						571						507						464						43						8
Due after five through 10 years			900						460						394						377						17						6
Due after 10 years			2,284						1,289						882						834						48						13
Total			$	4,414					$	2,329					$	1,865					$	1,685					$	180					$	28

Duke Energy Carolinas

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	84					$	—					$	—					$	62
Equity securities			3,483						11						4,856						3,386						33						4,751
Corporate debt securities			11						16						637						2						27						401
Municipal bonds			—						5						50						—						4						36
U.S. government bonds			17						28						1,397						—						50						991
Other debt securities			3						5						245						1						8						223
Total NDTF Investments			$	3,514					$	65					$	7,269					$	3,389					$	122					$	6,464

Debt Securities, Available-for-sale

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	84					$	—					$	—					$	62
Equity securities			3,483						11						4,856						3,386						33						4,751
Corporate debt securities			11						16						637						2						27						401
Municipal bonds			—						5						50						—						4						36
U.S. government bonds			17						28						1,397						—						50						991
Other debt securities			3						5						245						1						8						223
Total NDTF Investments			$	3,514					$	65					$	7,269					$	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 three and nine months ended September 30, 2025, and 2024, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
FV-NI:
Realized gains			$	490					$	38					$	594					$	163
Realized losses			12						9						53						30
AFS:
Realized gains			17						6						32						11
Realized losses			17						5						40						22

Progress Energy

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	88					$	—					$	—					$	77
Equity securities			2,455						6						3,579						2,367						28						3,482
Corporate debt securities			10						3						384						4						6						272
Municipal bonds			4						10						324						2						10						306
U.S. government bonds			15						15						1,091						3						34						815
Other debt securities			—						—						42						—						—						16
Total NDTF Investments			$	2,484					$	34					$	5,508					$	2,376					$	78					$	4,968
Other Investments
Cash and cash equivalents			$	—					$	—					$	14					$	—					$	—					$	23
Municipal bonds			—						1						24						—						—						24
Total Other Investments			$	—					$	1					$	38					$	—					$	—					$	47
Total Investments			$	2,484					$	35					$	5,546					$	2,376					$	78					$	5,015

Debt Securities, Available-for-sale

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	88					$	—					$	—					$	77
Equity securities			2,455						6						3,579						2,367						28						3,482
Corporate debt securities			10						3						384						4						6						272
Municipal bonds			4						10						324						2						10						306
U.S. government bonds			15						15						1,091						3						34						815
Other debt securities			—						—						42						—						—						16
Total NDTF Investments			$	2,484					$	34					$	5,508					$	2,376					$	78					$	4,968
Other Investments
Cash and cash equivalents			$	—					$	—					$	14					$	—					$	—					$	23
Municipal bonds			—						1						24						—						—						24
Total Other Investments			$	—					$	1					$	38					$	—					$	—					$	47
Total Investments			$	2,484					$	35					$	5,546					$	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 three and nine months ended September 30, 2025, and 2024, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
FV-NI:
Realized gains			$	358					$	23					$	421					$	93
Realized losses			9						10						49						34
AFS:
Realized gains			6						4						11						11
Realized losses			3						3						17						22

Duke Energy Progress

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	72					$	—					$	—					$	54
Equity securities			2,330						6						3,445						2,256						28						3,362
Corporate debt securities			10						3						367						4						6						256
Municipal bonds			4						10						324						2						10						306
U.S. government bonds			14						11						953						3						26						645
Other debt securities			—						—						41						—						—						14
Total NDTF Investments			$	2,358					$	30					$	5,202					$	2,265					$	70					$	4,637
Other Investments
Cash and cash equivalents			$	—					$	—					$	9					$	—					$	—					$	16
Total Other Investments			$	—					$	—					$	9					$	—					$	—					$	16
Total Investments			$	2,358					$	30					$	5,211					$	2,265					$	70					$	4,653

Debt Securities, Available-for-sale

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	72					$	—					$	—					$	54
Equity securities			2,330						6						3,445						2,256						28						3,362
Corporate debt securities			10						3						367						4						6						256
Municipal bonds			4						10						324						2						10						306
U.S. government bonds			14						11						953						3						26						645
Other debt securities			—						—						41						—						—						14
Total NDTF Investments			$	2,358					$	30					$	5,202					$	2,265					$	70					$	4,637
Other Investments
Cash and cash equivalents			$	—					$	—					$	9					$	—					$	—					$	16
Total Other Investments			$	—					$	—					$	9					$	—					$	—					$	16
Total Investments			$	2,358					$	30					$	5,211					$	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 three and nine months ended September 30, 2025, and 2024, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2025						September 30, 2024						September 30, 2025						September 30, 2024
FV-NI:
Realized gains			$	358					$	23					$	419					$	93
Realized losses			9						10						49						34
AFS:
Realized gains			5						4						10						11
Realized losses			3						3						16						21

Duke Energy Florida

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	16					$	—					$	—					$	23
Equity securities			125						—						134						111						—						120
Corporate debt securities			—						—						17						—						—						16
U.S. government bonds			1						4						138						—						8						170
Other debt securities			—						—						1						—						—						2
Total NDTF Investments(a)			$	126					$	4					$	306					$	111					$	8					$	331
Other Investments
Cash and cash equivalents			$	—					$	—					$	1					$	—					$	—					$	3
Municipal bonds			—						1						24						—						—						24
Total Other Investments			$	—					$	1					$	25					$	—					$	—					$	27
Total Investments			$	126					$	5					$	331					$	111					$	8					$	358

(a)During the nine months ended September 30, 2025, and the year ended December 31, 2024, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Debt Securities, Available-for-sale

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.

			September 30, 2025																		December 31, 2024
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
NDTF
Cash and cash equivalents			$	—					$	—					$	16					$	—					$	—					$	23
Equity securities			125						—						134						111						—						120
Corporate debt securities			—						—						17						—						—						16
U.S. government bonds			1						4						138						—						8						170
Other debt securities			—						—						1						—						—						2
Total NDTF Investments(a)			$	126					$	4					$	306					$	111					$	8					$	331
Other Investments
Cash and cash equivalents			$	—					$	—					$	1					$	—					$	—					$	3
Municipal bonds			—						1						24						—						—						24
Total Other Investments			$	—					$	1					$	25					$	—					$	—					$	27
Total Investments			$	126					$	5					$	331					$	111					$	8					$	358

(a)During the nine months ended September 30, 2025, and the year ended December 31, 2024, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Duke Energy Indiana

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

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.

			September 30, 2025																								December 31, 2024
			Gross						Gross																		Gross
			Unrealized						Unrealized						Estimated												Unrealized						Estimated
			Holding						Holding						Fair												Holding						Fair
(in millions)			Gains						Losses						Value												Losses						Value
Investments
Cash and cash equivalents			$	—					$	—					$	1											$	—					$	1
Equity securities			5						—						51												4						89
Corporate debt securities			—						—						1												—						6
Municipal bonds			—						1						24												1						43
U.S. government bonds			—						—						3												—						7
Total Investments			$	5					$	1					$	80											$	5					$	146

Debt Securities, Available-for-sale

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.

			September 30, 2025																								December 31, 2024
			Gross						Gross																		Gross
			Unrealized						Unrealized						Estimated												Unrealized						Estimated
			Holding						Holding						Fair												Holding						Fair
(in millions)			Gains						Losses						Value												Losses						Value
Investments
Cash and cash equivalents			$	—					$	—					$	1											$	—					$	1
Equity securities			5						—						51												4						89
Corporate debt securities			—						—						1												—						6
Municipal bonds			—						1						24												1						43
U.S. government bonds			—						—						3												—						7
Total Investments			$	5					$	1					$	80											$	5					$	146

X

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ 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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
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