Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2021

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	153	$	—	$	—	$	177
Equity securities	4,710		31		6,743		4,138		54		6,235
Corporate debt securities	51		3		861		76		1		806
Municipal bonds	17		—		298		22		—		370
U.S. government bonds	36		8		1,665		51		—		1,361
Other debt securities	6		—		188		8		—		180
Total NDTF Investments	$	4,820	$	42	$	9,908	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	83	$	—	$	—	$	127
Equity securities	98		—		166		79		—		146
Corporate debt securities	4		—		118		8		—		110
Municipal bonds	4		1		69		5		—		86
U.S. government bonds	1		—		66		—		—		42
Other debt securities	—		—		31		—		—		47
Total Other Investments	$	107	$	1	$	533	$	92	$	—	$	558
Total Investments	$	4,927	$	43	$	10,441	$	4,387	$	55	$	9,687

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	153	$	—	$	—	$	177
Equity securities	4,710		31		6,743		4,138		54		6,235
Corporate debt securities	51		3		861		76		1		806
Municipal bonds	17		—		298		22		—		370
U.S. government bonds	36		8		1,665		51		—		1,361
Other debt securities	6		—		188		8		—		180
Total NDTF Investments	$	4,820	$	42	$	9,908	$	4,295	$	55	$	9,129
Other Investments
Cash and cash equivalents	$	—	$	—	$	83	$	—	$	—	$	127
Equity securities	98		—		166		79		—		146
Corporate debt securities	4		—		118		8		—		110
Municipal bonds	4		1		69		5		—		86
U.S. government bonds	1		—		66		—		—		42
Other debt securities	—		—		31		—		—		47
Total Other Investments	$	107	$	1	$	533	$	92	$	—	$	558
Total Investments	$	4,927	$	43	$	10,441	$	4,387	$	55	$	9,687

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 six months ended June 30, 2021, and 2020, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
FV-NI:
Realized gains	$	146	$	302	$	286	$	325
Realized losses	37		67		60		132
AFS:
Realized gains	16		27		34		47
Realized losses	18		13		31		19

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	June 30, 2021
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	162	$	10	$	112	$	16	$	96	$	4
Due after one through five years	1,022		385		578		262		316		18
Due after five through 10 years	683		301		302		243		59		8
Due after 10 years	1,429		772		579		540		39		15
Total	$	3,296	$	1,468	$	1,571	$	1,061	$	510	$	45

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	68	$	—	$	—	$	30
Equity securities	2,729		14		3,910		2,442		23		3,685
Corporate debt securities	32		2		495		49		1		510
Municipal bonds	2		—		21		6		—		91
U.S. government bonds	19		3		770		25		—		475
Other debt securities	5		—		182		7		—		174
Total NDTF Investments	$	2,787	$	19	$	5,446	$	2,529	$	24	$	4,965

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	68	$	—	$	—	$	30
Equity securities	2,729		14		3,910		2,442		23		3,685
Corporate debt securities	32		2		495		49		1		510
Municipal bonds	2		—		21		6		—		91
U.S. government bonds	19		3		770		25		—		475
Other debt securities	5		—		182		7		—		174
Total NDTF Investments	$	2,787	$	19	$	5,446	$	2,529	$	24	$	4,965

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 six months ended June 30, 2021, and 2020, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
FV-NI:
Realized gains	$	90	$	27	$	218	$	36
Realized losses	23		25		39		70
AFS:
Realized gains	12		18		25		30
Realized losses	13		8		22		13

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	85	$	—	$	—	$	147
Equity securities	1,981		17		2,833		1,696		31		2,550
Corporate debt securities	19		1		366		27		—		296
Municipal bonds	15		—		277		16		—		279
U.S. government bonds	17		5		895		26		—		886
Other debt securities	1		—		6		1		—		6
Total NDTF Investments	$	2,033	$	23	$	4,462	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	4	$	—	$	—	$	106
Municipal bonds	3		—		27		3		—		26
Total Other Investments	$	3	$	—	$	31	$	3	$	—	$	132
Total Investments	$	2,036	$	23	$	4,493	$	1,769	$	31	$	4,296

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	85	$	—	$	—	$	147
Equity securities	1,981		17		2,833		1,696		31		2,550
Corporate debt securities	19		1		366		27		—		296
Municipal bonds	15		—		277		16		—		279
U.S. government bonds	17		5		895		26		—		886
Other debt securities	1		—		6		1		—		6
Total NDTF Investments	$	2,033	$	23	$	4,462	$	1,766	$	31	$	4,164
Other Investments
Cash and cash equivalents	$	—	$	—	$	4	$	—	$	—	$	106
Municipal bonds	3		—		27		3		—		26
Total Other Investments	$	3	$	—	$	31	$	3	$	—	$	132
Total Investments	$	2,036	$	23	$	4,493	$	1,769	$	31	$	4,296

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 six months ended June 30, 2021, and 2020, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
FV-NI:
Realized gains	$	56	$	275	$	68	$	289
Realized losses	14		42		21		62
AFS:
Realized gains	3		6		7		11
Realized losses	3		4		6		5

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	73	$	—	$	—	$	76
Equity securities	1,888		17		2,730		1,617		31		2,459
Corporate debt securities	19		1		299		27		—		296
Municipal bonds	15		—		277		16		—		279
U.S. government bonds	17		2		479		26		—		412
Other debt securities	1		—		6		1		—		6
Total NDTF Investments	$	1,940	$	20	$	3,864	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	1	$	—	$	—	$	1
Total Investments	$	1,940	$	20	$	3,865	$	1,687	$	31	$	3,529

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	73	$	—	$	—	$	76
Equity securities	1,888		17		2,730		1,617		31		2,459
Corporate debt securities	19		1		299		27		—		296
Municipal bonds	15		—		277		16		—		279
U.S. government bonds	17		2		479		26		—		412
Other debt securities	1		—		6		1		—		6
Total NDTF Investments	$	1,940	$	20	$	3,864	$	1,687	$	31	$	3,528
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Total Other Investments	$	—	$	—	$	1	$	—	$	—	$	1
Total Investments	$	1,940	$	20	$	3,865	$	1,687	$	31	$	3,529

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 six months ended June 30, 2021, and 2020, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
FV-NI:
Realized gains	$	55	$	26	$	67	$	40
Realized losses	13		27		20		47
AFS:
Realized gains	3		6		7		11
Realized losses	3		4		6		5

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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		103		79		—		91
Corporate debt securities	—		—		67		—		—		—
U.S. government bonds	—		3		416		—		—		474
Total NDTF Investments(a)	$	93	$	3	$	598	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	3		—		27		3		—		26
Total Other Investments	$	3	$	—	$	28	$	3	$	—	$	27
Total Investments	$	96	$	3	$	626	$	82	$	—	$	663

(a)During the six months ended June 30, 2021, and the year ended December 31, 2020, 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.

	June 30, 2021						December 31, 2020
	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	$	—	$	—	$	12	$	—	$	—	$	71
Equity securities	93		—		103		79		—		91
Corporate debt securities	—		—		67		—		—		—
U.S. government bonds	—		3		416		—		—		474
Total NDTF Investments(a)	$	93	$	3	$	598	$	79	$	—	$	636
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	3		—		27		3		—		26
Total Other Investments	$	3	$	—	$	28	$	3	$	—	$	27
Total Investments	$	96	$	3	$	626	$	82	$	—	$	663

(a)During the six months ended June 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI for the three and six months ended June 30, 2021, and 2020, were as follows:

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
FV-NI:
Realized gains	$	1	$	249	$	1	$	249
Realized losses	1		15		1		15

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.

	June 30, 2021						December 31, 2020
	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	70		—		110		58		—		97
Corporate debt securities	—		—		4		—		—		3
Municipal bonds	1		1		35		1		—		38
U.S. government bonds	—		—		6		—		—		4
Total Investments	$	71	$	1	$	156	$	59	$	—	$	143

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.

	June 30, 2021						December 31, 2020
	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	70		—		110		58		—		97
Corporate debt securities	—		—		4		—		—		3
Municipal bonds	1		1		35		1		—		38
U.S. government bonds	—		—		6		—		—		4
Total Investments	$	71	$	1	$	156	$	59	$	—	$	143