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Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2024

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, 2024																		December 31, 2023
			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			$	—					$	—					$	151					$	—					$	—					$	133
Equity securities			6,005						11						8,224						4,942						22						7,278
Corporate debt securities			20						29						721						12						43						632
Municipal bonds			5						10						342						6						16						347
U.S. government bonds			37						46						1,824						24						65						1,575
Other debt securities			3						7						248						1						13						178
Total NDTF Investments			$	6,070					$	103					$	11,510					$	4,985					$	159					$	10,143
Other Investments
Cash and cash equivalents			$	—					$	—					$	68					$	—					$	—					$	31
Equity securities			62						—						188						33						—						158
Corporate debt securities			—						3						92						—						6						82
Municipal bonds			1						1						89						1						2						77
U.S. government bonds			—						2						55						—						2						65
Other debt securities			—						2						48						—						2						47
Total Other Investments			$	63					$	8					$	540					$	34					$	12					$	460
Total Investments			$	6,133					$	111					$	12,050					$	5,019					$	171					$	10,603

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, 2024																		December 31, 2023
			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			$	—					$	—					$	151					$	—					$	—					$	133
Equity securities			6,005						11						8,224						4,942						22						7,278
Corporate debt securities			20						29						721						12						43						632
Municipal bonds			5						10						342						6						16						347
U.S. government bonds			37						46						1,824						24						65						1,575
Other debt securities			3						7						248						1						13						178
Total NDTF Investments			$	6,070					$	103					$	11,510					$	4,985					$	159					$	10,143
Other Investments
Cash and cash equivalents			$	—					$	—					$	68					$	—					$	—					$	31
Equity securities			62						—						188						33						—						158
Corporate debt securities			—						3						92						—						6						82
Municipal bonds			1						1						89						1						2						77
U.S. government bonds			—						2						55						—						2						65
Other debt securities			—						2						48						—						2						47
Total Other Investments			$	63					$	8					$	540					$	34					$	12					$	460
Total Investments			$	6,133					$	111					$	12,050					$	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 three and nine months ended September 30, 2024, and 2023, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2024						September 30, 2023						September 30, 2024						September 30, 2023
FV-NI:
Realized gains			$	61					$	61					$	256					$	107
Realized losses			19						35						64						117
AFS:
Realized gains			10						16						22						37
Realized losses			8						45						44						104

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

			September 30, 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			$	92					$	9					$	68					$	10					$	58					$	7
Due after one through five years			862						347						431						326						105						20
Due after five through 10 years			712						426						234						220						14						13
Due after 10 years			1,753						925						719						678						41						26
Total			$	3,419					$	1,707					$	1,452					$	1,234					$	218					$	66

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, 2024																		December 31, 2023
			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			$	—					$	—					$	69					$	—					$	—					$	51
Equity securities			3,476						8						4,729						2,886						14						4,196
Corporate debt securities			9						25						458						4						35						390
Municipal bonds			—						3						42						—						4						50
U.S. government bonds			19						25						976						13						33						826
Other debt securities			3						7						231						1						13						172
Total NDTF Investments			$	3,507					$	68					$	6,505					$	2,904					$	99					$	5,685

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, 2024																		December 31, 2023
			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			$	—					$	—					$	69					$	—					$	—					$	51
Equity securities			3,476						8						4,729						2,886						14						4,196
Corporate debt securities			9						25						458						4						35						390
Municipal bonds			—						3						42						—						4						50
U.S. government bonds			19						25						976						13						33						826
Other debt securities			3						7						231						1						13						172
Total NDTF Investments			$	3,507					$	68					$	6,505					$	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 three and nine months ended September 30, 2024, and 2023, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2024						September 30, 2023						September 30, 2024						September 30, 2023
FV-NI:
Realized gains			$	38					$	43					$	163					$	70
Realized losses			9						17						30						64
AFS:
Realized gains			6						12						11						21
Realized losses			5						26						22						54

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, 2024																		December 31, 2023
			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			$	—					$	—					$	82					$	—					$	—					$	82
Equity securities			2,529						3						3,495						2,056						8						3,082
Corporate debt securities			11						4						263						8						8						242
Municipal bonds			5						7						300						6						12						297
U.S. government bonds			18						21						848						11						32						749
Other debt securities			—						—						17						—						—						6
Total NDTF Investments			$	2,563					$	35					$	5,005					$	2,081					$	60					$	4,458
Other Investments
Cash and cash equivalents			$	—					$	—					$	21					$	—					$	—					$	18
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	45					$	—					$	1					$	41
Total Investments			$	2,563					$	35					$	5,050					$	2,081					$	61					$	4,499

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, 2024																		December 31, 2023
			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			$	—					$	—					$	82					$	—					$	—					$	82
Equity securities			2,529						3						3,495						2,056						8						3,082
Corporate debt securities			11						4						263						8						8						242
Municipal bonds			5						7						300						6						12						297
U.S. government bonds			18						21						848						11						32						749
Other debt securities			—						—						17						—						—						6
Total NDTF Investments			$	2,563					$	35					$	5,005					$	2,081					$	60					$	4,458
Other Investments
Cash and cash equivalents			$	—					$	—					$	21					$	—					$	—					$	18
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	45					$	—					$	1					$	41
Total Investments			$	2,563					$	35					$	5,050					$	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 three and nine months ended September 30, 2024, and 2023, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2024						September 30, 2023						September 30, 2024						September 30, 2023
FV-NI:
Realized gains			$	23					$	18					$	93					$	37
Realized losses			10						18						34						53
AFS:
Realized gains			4						4						11						16
Realized losses			3						19						22						50

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, 2024																		December 31, 2023
			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			$	—					$	—					$	61					$	—					$	—					$	55
Equity securities			2,407						3						3,361						1,956						8						2,970
Corporate debt securities			10						4						252						7						8						229
Municipal bonds			5						7						300						6						12						297
U.S. government bonds			17						13						666						10						18						518
Other debt securities			—						—						16						—						—						6
Total NDTF Investments			$	2,439					$	27					$	4,656					$	1,979					$	46					$	4,075
Other Investments
Cash and cash equivalents			$	—					$	—					$	16					$	—					$	—					$	14
Total Other Investments			$	—					$	—					$	16					$	—					$	—					$	14
Total Investments			$	2,439					$	27					$	4,672					$	1,979					$	46					$	4,089

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, 2024																		December 31, 2023
			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			$	—					$	—					$	61					$	—					$	—					$	55
Equity securities			2,407						3						3,361						1,956						8						2,970
Corporate debt securities			10						4						252						7						8						229
Municipal bonds			5						7						300						6						12						297
U.S. government bonds			17						13						666						10						18						518
Other debt securities			—						—						16						—						—						6
Total NDTF Investments			$	2,439					$	27					$	4,656					$	1,979					$	46					$	4,075
Other Investments
Cash and cash equivalents			$	—					$	—					$	16					$	—					$	—					$	14
Total Other Investments			$	—					$	—					$	16					$	—					$	—					$	14
Total Investments			$	2,439					$	27					$	4,672					$	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 three and nine months ended September 30, 2024, and 2023, were as follows.

			Three Months Ended												Nine Months Ended
(in millions)			September 30, 2024						September 30, 2023						September 30, 2024						September 30, 2023
FV-NI:
Realized gains			$	23					$	15					$	93					$	34
Realized losses			10						18						34						52
AFS:
Realized gains			4						4						11						15
Realized losses			3						18						21						47

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, 2024																		December 31, 2023
			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			$	—					$	—					$	21					$	—					$	—					$	27
Equity securities			122						—						134						100						—						112
Corporate debt securities			1						—						11						1						—						13
U.S. government bonds			1						8						182						1						14						231
Other debt securities			—						—						1						—						—						—
Total NDTF Investments(a)			$	124					$	8					$	349					$	102					$	14					$	383
Other Investments
Cash and cash equivalents			$	—					$	—					$	2					$	—					$	—					$	3
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	26					$	—					$	1					$	26
Total Investments			$	124					$	8					$	375					$	102					$	15					$	409

(a)During the nine months ended September 30, 2024, and the year ended December 31, 2023, 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, 2024																		December 31, 2023
			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			$	—					$	—					$	21					$	—					$	—					$	27
Equity securities			122						—						134						100						—						112
Corporate debt securities			1						—						11						1						—						13
U.S. government bonds			1						8						182						1						14						231
Other debt securities			—						—						1						—						—						—
Total NDTF Investments(a)			$	124					$	8					$	349					$	102					$	14					$	383
Other Investments
Cash and cash equivalents			$	—					$	—					$	2					$	—					$	—					$	3
Municipal bonds			—						—						24						—						1						23
Total Other Investments			$	—					$	—					$	26					$	—					$	1					$	26
Total Investments			$	124					$	8					$	375					$	102					$	15					$	409

(a)During the nine months ended September 30, 2024, and the year ended December 31, 2023, 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, 2024																		December 31, 2023
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
Investments
Cash and cash equivalents			$	—					$	—					$	2					$	—					$	—					$	1
Equity securities			22						—						117						4						—						98
Corporate debt securities			—						—						7						—						—						8
Municipal bonds			1						1						52						1						1						46
U.S. government bonds			—						—						7						—						—						10
Total Investments			$	23					$	1					$	185					$	5					$	1					$	163

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, 2024																		December 31, 2023
			Gross						Gross												Gross						Gross
			Unrealized						Unrealized						Estimated						Unrealized						Unrealized						Estimated
			Holding						Holding						Fair						Holding						Holding						Fair
(in millions)			Gains						Losses						Value						Gains						Losses						Value
Investments
Cash and cash equivalents			$	—					$	—					$	2					$	—					$	—					$	1
Equity securities			22						—						117						4						—						98
Corporate debt securities			—						—						7						—						—						8
Municipal bonds			1						1						52						1						1						46
U.S. government bonds			—						—						7						—						—						10
Total Investments			$	23					$	1					$	185					$	5					$	1					$	163

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
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