Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2022

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, 2022						December 31, 2021
	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	$	—	$	—	$	120	$	—	$	—	$	160
Equity securities	3,238		181		5,447		4,905		43		7,350
Corporate debt securities	—		116		682		39		6		829
Municipal bonds	—		49		319		14		1		314
U.S. government bonds	—		139		1,391		31		12		1,568
Other debt securities	—		20		164		3		1		180
Total NDTF Investments	$	3,238	$	505	$	8,123	$	4,992	$	63	$	10,401
Other Investments
Cash and cash equivalents	$	—	$	—	$	37	$	—	$	—	$	36
Equity securities	15		20		116		36		—		156
Corporate debt securities	—		14		81		2		1		119
Municipal bonds	—		4		80		3		1		80
U.S. government bonds	—		1		63		—		—		56
Other debt securities	—		3		40		—		1		45
Total Other Investments	$	15	$	42	$	417	$	41	$	3	$	492
Total Investments	$	3,253	$	547	$	8,540	$	5,033	$	66	$	10,893

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, 2022						December 31, 2021
	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	$	—	$	—	$	120	$	—	$	—	$	160
Equity securities	3,238		181		5,447		4,905		43		7,350
Corporate debt securities	—		116		682		39		6		829
Municipal bonds	—		49		319		14		1		314
U.S. government bonds	—		139		1,391		31		12		1,568
Other debt securities	—		20		164		3		1		180
Total NDTF Investments	$	3,238	$	505	$	8,123	$	4,992	$	63	$	10,401
Other Investments
Cash and cash equivalents	$	—	$	—	$	37	$	—	$	—	$	36
Equity securities	15		20		116		36		—		156
Corporate debt securities	—		14		81		2		1		119
Municipal bonds	—		4		80		3		1		80
U.S. government bonds	—		1		63		—		—		56
Other debt securities	—		3		40		—		1		45
Total Other Investments	$	15	$	42	$	417	$	41	$	3	$	492
Total Investments	$	3,253	$	547	$	8,540	$	5,033	$	66	$	10,893

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, 2022, and 2021, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
FV-NI:
Realized gains	$	25	$	34	$	170	$	320
Realized losses	61		40		247		100
AFS:
Realized gains	7		17		22		51
Realized losses	40		15		105		46

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	September 30, 2022
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	139	$	7	$	115	$	35	$	80	$	8
Due after one through five years	854		301		473		259		214		22
Due after five through 10 years	451		208		191		176		15		7
Due after 10 years	1,376		770		516		481		35		22
Total	$	2,820	$	1,286	$	1,295	$	951	$	344	$	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, 2022						December 31, 2021
	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	$	—	$	—	$	41	$	—	$	—	$	53
Equity securities	1,903		87		3,154		2,887		19		4,265
Corporate debt securities	—		86		433		24		4		506
Municipal bonds	—		13		57		2		—		48
U.S. government bonds	—		65		637		16		3		712
Other debt securities	—		19		159		3		1		175
Total NDTF Investments	$	1,903	$	270	$	4,481	$	2,932	$	27	$	5,759

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, 2022						December 31, 2021
	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	$	—	$	—	$	41	$	—	$	—	$	53
Equity securities	1,903		87		3,154		2,887		19		4,265
Corporate debt securities	—		86		433		24		4		506
Municipal bonds	—		13		57		2		—		48
U.S. government bonds	—		65		637		16		3		712
Other debt securities	—		19		159		3		1		175
Total NDTF Investments	$	1,903	$	270	$	4,481	$	2,932	$	27	$	5,759

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, 2022, and 2021, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
FV-NI:
Realized gains	$	16	$	25	$	109	$	243
Realized losses	39		29		143		68
AFS:
Realized gains	7		10		19		35
Realized losses	20		10		57		32

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, 2022						December 31, 2021
	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	$	—	$	—	$	79	$	—	$	—	$	107
Equity securities	1,335		94		2,293		2,018		24		3,085
Corporate debt securities	—		30		249		15		2		323
Municipal bonds	—		36		262		12		1		266
U.S. government bonds	—		74		754		15		9		856
Other debt securities	—		1		5		—		—		5
Total NDTF Investments	$	1,335	$	235	$	3,642	$	2,060	$	36	$	4,642
Other Investments
Cash and cash equivalents	$	—	$	—	$	13	$	—	$	—	$	20
Municipal bonds	—		—		25		2		—		26
Total Other Investments	$	—	$	—	$	38	$	2	$	—	$	46
Total Investments	$	1,335	$	235	$	3,680	$	2,062	$	36	$	4,688

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, 2022						December 31, 2021
	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	$	—	$	—	$	79	$	—	$	—	$	107
Equity securities	1,335		94		2,293		2,018		24		3,085
Corporate debt securities	—		30		249		15		2		323
Municipal bonds	—		36		262		12		1		266
U.S. government bonds	—		74		754		15		9		856
Other debt securities	—		1		5		—		—		5
Total NDTF Investments	$	1,335	$	235	$	3,642	$	2,060	$	36	$	4,642
Other Investments
Cash and cash equivalents	$	—	$	—	$	13	$	—	$	—	$	20
Municipal bonds	—		—		25		2		—		26
Total Other Investments	$	—	$	—	$	38	$	2	$	—	$	46
Total Investments	$	1,335	$	235	$	3,680	$	2,062	$	36	$	4,688

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, 2022, and 2021, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
FV-NI:
Realized gains	$	9	$	9	$	61	$	77
Realized losses	22		11		104		32
AFS:
Realized gains	—		7		3		14
Realized losses	9		6		32		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.

	September 30, 2022						December 31, 2021
	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	$	—	$	—	$	47	$	—	$	—	$	94
Equity securities	1,261		94		2,206		1,915		23		2,970
Corporate debt securities	—		29		234		15		2		282
Municipal bonds	—		36		262		12		1		266
U.S. government bonds	—		47		450		15		3		472
Other debt securities	—		1		5		—		—		5
Total NDTF Investments	$	1,261	$	207	$	3,204	$	1,957	$	29	$	4,089
Other Investments
Cash and cash equivalents	$	—	$	—	$	11	$	—	$	—	$	16
Total Other Investments	$	—	$	—	$	11	$	—	$	—	$	16
Total Investments	$	1,261	$	207	$	3,215	$	1,957	$	29	$	4,105

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, 2022						December 31, 2021
	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	$	—	$	—	$	47	$	—	$	—	$	94
Equity securities	1,261		94		2,206		1,915		23		2,970
Corporate debt securities	—		29		234		15		2		282
Municipal bonds	—		36		262		12		1		266
U.S. government bonds	—		47		450		15		3		472
Other debt securities	—		1		5		—		—		5
Total NDTF Investments	$	1,261	$	207	$	3,204	$	1,957	$	29	$	4,089
Other Investments
Cash and cash equivalents	$	—	$	—	$	11	$	—	$	—	$	16
Total Other Investments	$	—	$	—	$	11	$	—	$	—	$	16
Total Investments	$	1,261	$	207	$	3,215	$	1,957	$	29	$	4,105

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, 2022, and 2021, were as follows.

	Three Months Ended				Nine Months Ended
(in millions)	September 30, 2022		September 30, 2021		September 30, 2022		September 30, 2021
FV-NI:
Realized gains	$	9	$	9	$	60	$	76
Realized losses	21		11		101		31
AFS:
Realized gains	—		6		3		13
Realized losses	9		5		29		11

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, 2022						December 31, 2021
	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	$	—	$	—	$	32	$	—	$	—	$	13
Equity securities	74		—		87		103		1		115
Corporate debt securities	—		1		15		—		—		41
U.S. government bonds	—		27		304		—		6		384
Total NDTF Investments(a)	$	74	$	28	$	438	$	103	$	7	$	553
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	3
Municipal bonds	—		—		25		2		—		26
Total Other Investments	$	—	$	—	$	26	$	2	$	—	$	29
Total Investments	$	74	$	28	$	464	$	105	$	7	$	582

(a)During the nine months ended September 30, 2022, and the year ended December 31, 2021, 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, 2022						December 31, 2021
	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	$	—	$	—	$	32	$	—	$	—	$	13
Equity securities	74		—		87		103		1		115
Corporate debt securities	—		1		15		—		—		41
U.S. government bonds	—		27		304		—		6		384
Total NDTF Investments(a)	$	74	$	28	$	438	$	103	$	7	$	553
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	3
Municipal bonds	—		—		25		2		—		26
Total Other Investments	$	—	$	—	$	26	$	2	$	—	$	29
Total Investments	$	74	$	28	$	464	$	105	$	7	$	582

(a)During the nine months ended September 30, 2022, and the year ended December 31, 2021, 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, 2022						December 31, 2021
	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	$	—	$	—	$	—
Equity securities	—		20		72		6		—		97
Corporate debt securities	—		1		7		—		—		6
Municipal bonds	—		4		45		1		1		46
U.S. government bonds	—		—		7		—		—		12
Total Investments	$	—	$	25	$	132	$	7	$	1	$	161

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, 2022						December 31, 2021
	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	$	—	$	—	$	—
Equity securities	—		20		72		6		—		97
Corporate debt securities	—		1		7		—		—		6
Municipal bonds	—		4		45		1		1		46
U.S. government bonds	—		—		7		—		—		12
Total Investments	$	—	$	25	$	132	$	7	$	1	$	161