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Investments in Debt and Equity Securities (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023						December 31, 2022
	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	$	—	$	—	$	133	$	—	$	—	$	215
Equity securities	4,942		22		7,278		3,658		105		5,871
Corporate debt securities	12		43		632		1		85		641
Municipal bonds	6		16		347		—		39		330
U.S. government bonds	24		65		1,575		2		112		1,423
Other debt securities	1		13		178		—		18		156
Total NDTF Investments	$	4,985	$	159	$	10,143	$	3,661	$	359	$	8,636
Other Investments
Cash and cash equivalents	$	—	$	—	$	31	$	—	$	—	$	22
Equity securities	33		—		158		21		16		128
Corporate debt securities	—		6		82		—		12		84
Municipal bonds	1		2		77		—		3		78
U.S. government bonds	—		2		65		—		2		62
Other debt securities	—		2		47		—		3		41
Total Other Investments	$	34	$	12	$	460	$	21	$	36	$	415
Total Investments	$	5,019	$	171	$	10,603	$	3,682	$	395	$	9,051

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, 2023, 2022 and 2021, were as follows.


	Years Ended December 31,
(in millions)	2023		2022		2021
FV-NI:
Realized gains	$	129	$	201	$	724
Realized losses	146		316		141
AFS:
Realized gains	44		28		56
Realized losses	140		151		54

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.


	December 31, 2023
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	116	$	9	$	89	$	13	$	76	$	7
Due after one through five years	696		226		391		254		137		20
Due after five through 10 years	598		333		217		204		13		11
Due after 10 years	1,593		870		620		579		41		26
Total	$	3,003	$	1,438	$	1,317	$	1,050	$	267	$	64

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, 2023						December 31, 2022
	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	$	—	$	—	$	51	$	—	$	—	$	117
Equity securities	2,886		14		4,196		2,147		51		3,367
Corporate debt securities	4		35		390		1		62		401
Municipal bonds	—		4		50		—		10		64
U.S. government bonds	13		33		826		1		51		685
Other debt securities	1		13		172		—		18		148
Total NDTF Investments	$	2,904	$	99	$	5,685	$	2,149	$	192	$	4,782

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, 2023, 2022 and 2021, were as follows.


	Years Ended December 31,
(in millions)	2023		2022		2021
FV-NI:
Realized gains	$	82	$	124	$	440
Realized losses	79		177		96
AFS:
Realized gains	22		22		38
Realized losses	65		86		37

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, 2023						December 31, 2022
	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	$	—	$	—	$	82	$	—	$	—	$	98
Equity securities	2,056		8		3,082		1,511		54		2,504
Corporate debt securities	8		8		242		—		23		240
Municipal bonds	6		12		297		—		29		266
U.S. government bonds	11		32		749		1		61		738
Other debt securities	—		—		6		—		—		8
Total NDTF Investments	$	2,081	$	60	$	4,458	$	1,512	$	167	$	3,854
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	11
Municipal bonds	—		1		23		—		—		25
Total Other Investments	$	—	$	1	$	41	$	—	$	—	$	36
Total Investments	$	2,081	$	61	$	4,499	$	1,512	$	167	$	3,890

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, 2023, 2022 and 2021, were as follows.


	Years Ended December 31,
(in millions)	2023		2022		2021
FV-NI:
Realized gains	$	47	$	77	$	284
Realized losses	67		139		45
AFS:
Realized gains	22		6		16
Realized losses	75		48		14

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, 2023						December 31, 2022
	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	$	—	$	—	$	55	$	—	$	—	$	56
Equity securities	1,956		8		2,970		1,431		54		2,411
Corporate debt securities	7		8		229		—		22		230
Municipal bonds	6		12		297		—		29		266
U.S. government bonds	10		18		518		1		37		460
Other debt securities	—		—		6		—		—		7
Total NDTF Investments	$	1,979	$	46	$	4,075	$	1,432	$	142	$	3,430
Other Investments
Cash and cash equivalents	$	—	$	—	$	14	$	—	$	—	$	9
Total Other Investments	$	—	$	—	$	14	$	—	$	—	$	9
Total Investments	$	1,979	$	46	$	4,089	$	1,432	$	142	$	3,439

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, 2023, 2022 and 2021, were as follows.


	Years Ended December 31,
(in millions)	2023		2022		2021
FV-NI:
Realized gains	$	44	$	76	$	283
Realized losses	66		136		44
AFS:
Realized gains	20		6		15
Realized losses	70		44		13

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, 2023						December 31, 2022
	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	$	—	$	—	$	27	$	—	$	—	$	42
Equity securities	100		—		112		80		—		93
Corporate debt securities	1		—		13		—		1		10

U.S. government bonds	1		14		231		—		24		278
Other debt securities	—		—		—		—		—		1
Total NDTF Investments(a)	$	102	$	14	$	383	$	80	$	25	$	424
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	1
Municipal bonds	—		1		23				—		25
Total Other Investments	$	—	$	1	$	26	$	—	$	—	$	26
Total Investments	$	102	$	15	$	409	$	80	$	25	$	450

(a) During the years ended December 31, 2023, and 2022, 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, 2023						December 31, 2022
	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		—		98		2		16		79
Corporate debt securities	—		—		8		—		1		8
Municipal bonds	1		1		46		—		3		45
U.S. government bonds	—		—		10		—		—		7


Total Investments	$	5	$	1	$	163	$	2	$	20	$	140