Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2023

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, 2023						December 31, 2022
	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	$	—	$	—	$	160	$	—	$	—	$	215
Equity securities	4,218		44		6,530		3,658		105		5,871
Corporate debt securities	—		80		612		1		85		641
Municipal bonds	—		41		318		—		39		330
U.S. government bonds	—		136		1,470		2		112		1,423
Other debt securities	—		18		169		—		18		156
Total NDTF Investments	$	4,218	$	319	$	9,259	$	3,661	$	359	$	8,636
Other Investments
Cash and cash equivalents	$	—	$	—	$	36	$	—	$	—	$	22
Equity securities	26		9		141		21		16		128
Corporate debt securities	—		10		83		—		12		84
Municipal bonds	—		3		74		—		3		78
U.S. government bonds	—		5		46		—		2		62
Other debt securities	—		5		52		—		3		41
Total Other Investments	$	26	$	32	$	432	$	21	$	36	$	415
Total Investments	$	4,244	$	351	$	9,691	$	3,682	$	395	$	9,051

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, 2023						December 31, 2022
	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	$	—	$	—	$	160	$	—	$	—	$	215
Equity securities	4,218		44		6,530		3,658		105		5,871
Corporate debt securities	—		80		612		1		85		641
Municipal bonds	—		41		318		—		39		330
U.S. government bonds	—		136		1,470		2		112		1,423
Other debt securities	—		18		169		—		18		156
Total NDTF Investments	$	4,218	$	319	$	9,259	$	3,661	$	359	$	8,636
Other Investments
Cash and cash equivalents	$	—	$	—	$	36	$	—	$	—	$	22
Equity securities	26		9		141		21		16		128
Corporate debt securities	—		10		83		—		12		84
Municipal bonds	—		3		74		—		3		78
U.S. government bonds	—		5		46		—		2		62
Other debt securities	—		5		52		—		3		41
Total Other Investments	$	26	$	32	$	432	$	21	$	36	$	415
Total Investments	$	4,244	$	351	$	9,691	$	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 three and nine months ended September 30, 2023, and 2022, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2023		September 30, 2022		September 30, 2023		September 30, 2022
FV-NI:
Realized gains	$	61	$	25	$	107	$	170
Realized losses	35		61		117		247
AFS:
Realized gains	16		7		37		22
Realized losses	45		40		104		105

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	September 30, 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	$	137	$	7	$	109	$	21	$	88	$	7
Due after one through five years	671		209		388		235		153		19
Due after five through 10 years	545		311		197		184		13		10
Due after 10 years	1,471		802		569		531		38		23
Total	$	2,824	$	1,329	$	1,263	$	971	$	292	$	59

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, 2023						December 31, 2022
	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	$	—	$	—	$	117
Equity securities	2,468		25		3,767		2,147		51		3,367
Corporate debt securities	—		60		376		1		62		401
Municipal bonds	—		9		45		—		10		64
U.S. government bonds	—		73		745		1		51		685
Other debt securities	—		18		163		—		18		148
Total NDTF Investments	$	2,468	$	185	$	5,155	$	2,149	$	192	$	4,782

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, 2023						December 31, 2022
	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	$	—	$	—	$	117
Equity securities	2,468		25		3,767		2,147		51		3,367
Corporate debt securities	—		60		376		1		62		401
Municipal bonds	—		9		45		—		10		64
U.S. government bonds	—		73		745		1		51		685
Other debt securities	—		18		163		—		18		148
Total NDTF Investments	$	2,468	$	185	$	5,155	$	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 three and nine months ended September 30, 2023, and 2022, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2023		September 30, 2022		September 30, 2023		September 30, 2022
FV-NI:
Realized gains	$	43	$	16	$	70	$	109
Realized losses	17		39		64		143
AFS:
Realized gains	12		7		21		19
Realized losses	26		20		54		57

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, 2023						December 31, 2022
	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	$	—	$	—	$	101	$	—	$	—	$	98
Equity securities	1,750		19		2,763		1,511		54		2,504
Corporate debt securities	—		20		236		—		23		240
Municipal bonds	—		32		273		—		29		266
U.S. government bonds	—		63		725		1		61		738
Other debt securities	—		—		6		—		—		8
Total NDTF Investments	$	1,750	$	134	$	4,104	$	1,512	$	167	$	3,854
Other Investments
Cash and cash equivalents	$	—	$	—	$	8	$	—	$	—	$	11
Municipal bonds	—		—		23		—		—		25
Total Other Investments	$	—	$	—	$	31	$	—	$	—	$	36
Total Investments	$	1,750	$	134	$	4,135	$	1,512	$	167	$	3,890

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, 2023						December 31, 2022
	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	$	—	$	—	$	101	$	—	$	—	$	98
Equity securities	1,750		19		2,763		1,511		54		2,504
Corporate debt securities	—		20		236		—		23		240
Municipal bonds	—		32		273		—		29		266
U.S. government bonds	—		63		725		1		61		738
Other debt securities	—		—		6		—		—		8
Total NDTF Investments	$	1,750	$	134	$	4,104	$	1,512	$	167	$	3,854
Other Investments
Cash and cash equivalents	$	—	$	—	$	8	$	—	$	—	$	11
Municipal bonds	—		—		23		—		—		25
Total Other Investments	$	—	$	—	$	31	$	—	$	—	$	36
Total Investments	$	1,750	$	134	$	4,135	$	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 three and nine months ended September 30, 2023, and 2022, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2023		September 30, 2022		September 30, 2023		September 30, 2022
FV-NI:
Realized gains	$	18	$	9	$	37	$	61
Realized losses	18		22		53		104
AFS:
Realized gains	4		—		16		3
Realized losses	19		9		50		32

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, 2023						December 31, 2022
	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	$	—	$	—	$	62	$	—	$	—	$	56
Equity securities	1,661		19		2,663		1,431		54		2,411
Corporate debt securities	—		19		224		—		22		230
Municipal bonds	—		32		273		—		29		266
U.S. government bonds	—		43		469		1		37		460
Other debt securities	—		—		5		—		—		7
Total NDTF Investments	$	1,661	$	113	$	3,696	$	1,432	$	142	$	3,430
Other Investments
Cash and cash equivalents	$	—	$	—	$	4	$	—	$	—	$	9
Total Other Investments	$	—	$	—	$	4	$	—	$	—	$	9
Total Investments	$	1,661	$	113	$	3,700	$	1,432	$	142	$	3,439

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, 2023						December 31, 2022
	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	$	—	$	—	$	62	$	—	$	—	$	56
Equity securities	1,661		19		2,663		1,431		54		2,411
Corporate debt securities	—		19		224		—		22		230
Municipal bonds	—		32		273		—		29		266
U.S. government bonds	—		43		469		1		37		460
Other debt securities	—		—		5		—		—		7
Total NDTF Investments	$	1,661	$	113	$	3,696	$	1,432	$	142	$	3,430
Other Investments
Cash and cash equivalents	$	—	$	—	$	4	$	—	$	—	$	9
Total Other Investments	$	—	$	—	$	4	$	—	$	—	$	9
Total Investments	$	1,661	$	113	$	3,700	$	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 three and nine months ended September 30, 2023, and 2022, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2023		September 30, 2022		September 30, 2023		September 30, 2022
FV-NI:
Realized gains	$	15	$	9	$	34	$	60
Realized losses	18		21		52		101
AFS:
Realized gains	4		—		15		3
Realized losses	18		9		47		29

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, 2023						December 31, 2022
	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	$	—	$	—	$	39	$	—	$	—	$	42
Equity securities	89		—		100		80		—		93
Corporate debt securities	—		1		12		—		1		10
U.S. government bonds	—		20		256		—		24		278
Other debt securities	—		—		1		—		—		1
Total NDTF Investments(a)	$	89	$	21	$	408	$	80	$	25	$	424
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	—		—		23		—		—		25
Total Other Investments	$	—	$	—	$	24	$	—	$	—	$	26
Total Investments	$	89	$	21	$	432	$	80	$	25	$	450

(a)During the nine months ended September 30, 2023, and the year ended December 31, 2022, 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, 2023						December 31, 2022
	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	$	—	$	—	$	39	$	—	$	—	$	42
Equity securities	89		—		100		80		—		93
Corporate debt securities	—		1		12		—		1		10
U.S. government bonds	—		20		256		—		24		278
Other debt securities	—		—		1		—		—		1
Total NDTF Investments(a)	$	89	$	21	$	408	$	80	$	25	$	424
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	—		—		23		—		—		25
Total Other Investments	$	—	$	—	$	24	$	—	$	—	$	26
Total Investments	$	89	$	21	$	432	$	80	$	25	$	450

(a)During the nine months ended September 30, 2023, and the year ended December 31, 2022, 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, 2023						December 31, 2022
	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	$	—	$	—	$	3	$	—	$	—	$	1
Equity securities	3		9		88		2		16		79
Corporate debt securities	—		—		9		—		1		8
Municipal bonds	—		3		44		—		3		45
U.S. government bonds	—		—		6		—		—		7
Total Investments	$	3	$	12	$	150	$	2	$	20	$	140

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, 2023						December 31, 2022
	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	$	—	$	—	$	3	$	—	$	—	$	1
Equity securities	3		9		88		2		16		79
Corporate debt securities	—		—		9		—		1		8
Municipal bonds	—		3		44		—		3		45
U.S. government bonds	—		—		6		—		—		7
Total Investments	$	3	$	12	$	150	$	2	$	20	$	140