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Investments in Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 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.


	March 31, 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	$	—	$	—	$	140	$	—	$	—	$	133
Equity securities	5,553		27		7,837		4,942		22		7,278
Corporate debt securities	8		46		659		12		43		632
Municipal bonds	4		16		332		6		16		347
U.S. government bonds	9		76		1,610		24		65		1,575

Other debt securities	—		13		209		1		13		178
Total NDTF Investments	$	5,574	$	178	$	10,787	$	4,985	$	159	$	10,143
Other Investments
Cash and cash equivalents	$	—	$	—	$	21	$	—	$	—	$	31
Equity securities	47		—		173		33		—		158
Corporate debt securities	—		6		87		—		6		82
Municipal bonds	—		1		79		1		2		77
U.S. government bonds	—		3		60		—		2		65
Other debt securities	—		3		45		—		2		47
Total Other Investments	$	47	$	13	$	465	$	34	$	12	$	460
Total Investments	$	5,621	$	191	$	11,252	$	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.


	March 31, 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	$	—	$	—	$	140	$	—	$	—	$	133
Equity securities	5,553		27		7,837		4,942		22		7,278
Corporate debt securities	8		46		659		12		43		632
Municipal bonds	4		16		332		6		16		347
U.S. government bonds	9		76		1,610		24		65		1,575

Other debt securities	—		13		209		1		13		178
Total NDTF Investments	$	5,574	$	178	$	10,787	$	4,985	$	159	$	10,143
Other Investments
Cash and cash equivalents	$	—	$	—	$	21	$	—	$	—	$	31
Equity securities	47		—		173		33		—		158
Corporate debt securities	—		6		87		—		6		82
Municipal bonds	—		1		79		1		2		77
U.S. government bonds	—		3		60		—		2		65
Other debt securities	—		3		45		—		2		47
Total Other Investments	$	47	$	13	$	465	$	34	$	12	$	460
Total Investments	$	5,621	$	191	$	11,252	$	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 months ended March 31, 2024, and 2023, were as follows.


	Three Months Ended
(in millions)		March 31, 2024		March 31, 2023
FV-NI:
Realized gains		$	68	$	26
Realized losses		18		46
AFS:
Realized gains		10		8
Realized losses		14		32

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.


	March 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	$	126	$	10	$	101	$	23	$	78	$	9
Due after one through five years	715		245		389		264		125		18
Due after five through 10 years	614		359		206		192		14		11
Due after 10 years	1,626		866		658		618		40		25
Total	$	3,081	$	1,480	$	1,354	$	1,097	$	257	$	63

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.


	March 31, 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	$	—	$	—	$	81	$	—	$	—	$	51
Equity securities	3,226		19		4,514		2,886		14		4,196
Corporate debt securities	2		37		397		4		35		390
Municipal bonds	—		4		38		—		4		50
U.S. government bonds	4		41		854		13		33		826
Other debt securities	—		13		191		1		13		172
Total NDTF Investments	$	3,232	$	114	$	6,075	$	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.


	March 31, 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	$	—	$	—	$	81	$	—	$	—	$	51
Equity securities	3,226		19		4,514		2,886		14		4,196
Corporate debt securities	2		37		397		4		35		390
Municipal bonds	—		4		38		—		4		50
U.S. government bonds	4		41		854		13		33		826
Other debt securities	—		13		191		1		13		172
Total NDTF Investments	$	3,232	$	114	$	6,075	$	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 months ended March 31, 2024, and 2023, were as follows.


	Three Months Ended
(in millions)		March 31, 2024		March 31, 2023
FV-NI:
Realized gains		$	53	$	18
Realized losses		6		29
AFS:
Realized gains		4		5
Realized losses		6		20

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.


	March 31, 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	$	—	$	—	$	59	$	—	$	—	$	82
Equity securities	2,327		8		3,323		2,056		8		3,082
Corporate debt securities	6		9		262		8		8		242
Municipal bonds	4		12		294		6		12		297
U.S. government bonds	5		35		756		11		32		749

Other debt securities	—		—		18		—		—		6
Total NDTF Investments	$	2,342	$	64	$	4,712	$	2,081	$	60	$	4,458
Other Investments
Cash and cash equivalents	$	—	$	—	$	15	$	—	$	—	$	18

Municipal bonds	—		—		24		—		1		23
Total Other Investments	$	—	$	—	$	39	$	—	$	1	$	41
Total Investments	$	2,342	$	64	$	4,751	$	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.


	March 31, 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	$	—	$	—	$	59	$	—	$	—	$	82
Equity securities	2,327		8		3,323		2,056		8		3,082
Corporate debt securities	6		9		262		8		8		242
Municipal bonds	4		12		294		6		12		297
U.S. government bonds	5		35		756		11		32		749

Other debt securities	—		—		18		—		—		6
Total NDTF Investments	$	2,342	$	64	$	4,712	$	2,081	$	60	$	4,458
Other Investments
Cash and cash equivalents	$	—	$	—	$	15	$	—	$	—	$	18

Municipal bonds	—		—		24		—		1		23
Total Other Investments	$	—	$	—	$	39	$	—	$	1	$	41
Total Investments	$	2,342	$	64	$	4,751	$	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 months ended March 31, 2024, and 2023, were as follows.


	Three Months Ended
(in millions)		March 31, 2024		March 31, 2023
FV-NI:
Realized gains		$	15	$	8
Realized losses		12		17
AFS:
Realized gains		6		3
Realized losses		8		12

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.


	March 31, 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	$	—	$	—	$	48	$	—	$	—	$	55
Equity securities	2,216		8		3,200		1,956		8		2,970
Corporate debt securities	5		9		248		7		8		229
Municipal bonds	4		12		294		6		12		297
U.S. government bonds	5		22		539		10		18		518
Other debt securities	—		—		16		—		—		6
Total NDTF Investments	$	2,230	$	51	$	4,345	$	1,979	$	46	$	4,075
Other Investments
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	14
Total Other Investments	$	—	$	—	$	12	$	—	$	—	$	14
Total Investments	$	2,230	$	51	$	4,357	$	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.


	March 31, 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	$	—	$	—	$	48	$	—	$	—	$	55
Equity securities	2,216		8		3,200		1,956		8		2,970
Corporate debt securities	5		9		248		7		8		229
Municipal bonds	4		12		294		6		12		297
U.S. government bonds	5		22		539		10		18		518
Other debt securities	—		—		16		—		—		6
Total NDTF Investments	$	2,230	$	51	$	4,345	$	1,979	$	46	$	4,075
Other Investments
Cash and cash equivalents	$	—	$	—	$	12	$	—	$	—	$	14
Total Other Investments	$	—	$	—	$	12	$	—	$	—	$	14
Total Investments	$	2,230	$	51	$	4,357	$	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 months ended March 31, 2024, and 2023, were as follows.


	Three Months Ended
(in millions)		March 31, 2024		March 31, 2023
FV-NI:
Realized gains		$	15	$	8
Realized losses		12		17
AFS:
Realized gains		6		3
Realized losses		8		12

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.


	March 31, 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	$	—	$	—	$	11	$	—	$	—	$	27
Equity securities	111		—		123		100		—		112
Corporate debt securities	1		—		14		1		—		13

U.S. government bonds	—		13		217		1		14		231

Other debt securities	—		—		2		—		—		—
Total NDTF Investments(a)	$	112	$	13	$	367	$	102	$	14	$	383
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	3

Municipal bonds	—		—		24		—		1		23
Total Other Investments	$	—	$	—	$	26	$	—	$	1	$	26
Total Investments	$	112	$	13	$	393	$	102	$	15	$	409

(a)During the three months ended March 31, 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.


	March 31, 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	$	—	$	—	$	11	$	—	$	—	$	27
Equity securities	111		—		123		100		—		112
Corporate debt securities	1		—		14		1		—		13

U.S. government bonds	—		13		217		1		14		231

Other debt securities	—		—		2		—		—		—
Total NDTF Investments(a)	$	112	$	13	$	367	$	102	$	14	$	383
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	3

Municipal bonds	—		—		24		—		1		23
Total Other Investments	$	—	$	—	$	26	$	—	$	1	$	26
Total Investments	$	112	$	13	$	393	$	102	$	15	$	409

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.


	March 31, 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	$	—	$	—	$	1	$	—	$	—	$	1
Equity securities	13		—		108		4		—		98
Corporate debt securities	—		—		8		—		—		8
Municipal bonds	—		1		45		1		1		46
U.S. government bonds	—		—		10		—		—		10

Total Investments	$	13	$	1	$	172	$	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.


	March 31, 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	$	—	$	—	$	1	$	—	$	—	$	1
Equity securities	13		—		108		4		—		98
Corporate debt securities	—		—		8		—		—		8
Municipal bonds	—		1		45		1		1		46
U.S. government bonds	—		—		10		—		—		10

Total Investments	$	13	$	1	$	172	$	5	$	1	$	163