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Investments in Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019						December 31, 2018
	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	$	—	$	—	$	114	$	—	$	—	$	88
Equity securities	2,923		65		5,061		2,402		95		4,475
Corporate debt securities	17		2		624		4		13		566
Municipal bonds	5		1		317		1		4		353
U.S. government bonds	25		5		1,102		14		12		1,076
Other debt securities	1		1		145		—		2		148
Total NDTF Investments	$	2,971	$	74	$	7,363	$	2,421	$	126	$	6,706
Other Investments
Cash and cash equivalents	$	—	$	—	$	51	$	—	$	—	$	22
Equity securities	47		—		112		36		1		99
Corporate debt securities	1		—		57		—		2		60
Municipal bonds	2		1		89		—		1		85
U.S. government bonds	1		—		52		1		—		45
Other debt securities	—		1		61		—		1		58
Total Other Investments	$	51	$	2	$	422	$	37	$	5	$	369
Total Investments	$	3,022	$	76	$	7,785	$	2,458	$	131	$	7,075

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, 2019						December 31, 2018
	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	$	—	$	—	$	114	$	—	$	—	$	88
Equity securities	2,923		65		5,061		2,402		95		4,475
Corporate debt securities	17		2		624		4		13		566
Municipal bonds	5		1		317		1		4		353
U.S. government bonds	25		5		1,102		14		12		1,076
Other debt securities	1		1		145		—		2		148
Total NDTF Investments	$	2,971	$	74	$	7,363	$	2,421	$	126	$	6,706
Other Investments
Cash and cash equivalents	$	—	$	—	$	51	$	—	$	—	$	22
Equity securities	47		—		112		36		1		99
Corporate debt securities	1		—		57		—		2		60
Municipal bonds	2		1		89		—		1		85
U.S. government bonds	1		—		52		1		—		45
Other debt securities	—		1		61		—		1		58
Total Other Investments	$	51	$	2	$	422	$	37	$	5	$	369
Total Investments	$	3,022	$	76	$	7,785	$	2,458	$	131	$	7,075

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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	$	—	$	—	$	114	$	—	$	—	$	88
Equity securities	2,923		65		5,061		2,402		95		4,475
Corporate debt securities	17		2		624		4		13		566
Municipal bonds	5		1		317		1		4		353
U.S. government bonds	25		5		1,102		14		12		1,076
Other debt securities	1		1		145		—		2		148
Total NDTF Investments	$	2,971	$	74	$	7,363	$	2,421	$	126	$	6,706
Other Investments
Cash and cash equivalents	$	—	$	—	$	51	$	—	$	—	$	22
Equity securities	47		—		112		36		1		99
Corporate debt securities	1		—		57		—		2		60
Municipal bonds	2		1		89		—		1		85
U.S. government bonds	1		—		52		1		—		45
Other debt securities	—		1		61		—		1		58
Total Other Investments	$	51	$	2	$	422	$	37	$	5	$	369
Total Investments	$	3,022	$	76	$	7,785	$	2,458	$	131	$	7,075

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



	March 31, 2019
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	74	$	9	$	41	$	21	$	20	$	4
Due after one through five years	537		153		341		251		90		17
Due after five through 10 years	577		287		245		196		49		4
Due after 10 years	1,259		616		545		415		130		17
Total	$	2,447	$	1,065	$	1,172	$	883	$	289	$	42

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, 2019, and 2018, were as follows.



	Three Months Ended
(in millions)	March 31, 2019		March 31, 2018
FV-NI:
Realized gains	$	35	$	19
Realized losses	30		13
AFS:
Realized gains	10		5
Realized losses	11		13

Duke Energy Carolinas [Member]

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, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	29
Equity securities	1,593		37		2,791		1,309		54		2,484
Corporate debt securities	9		2		354		2		9		341
Municipal bonds	1		—		62		—		1		81
U.S. government bonds	11		3		509		5		8		475
Other debt securities	1		1		140		—		2		143
Total NDTF Investments	$	1,615	$	43	$	3,913	$	1,316	$	74	$	3,553

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, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	29
Equity securities	1,593		37		2,791		1,309		54		2,484
Corporate debt securities	9		2		354		2		9		341
Municipal bonds	1		—		62		—		1		81
U.S. government bonds	11		3		509		5		8		475
Other debt securities	1		1		140		—		2		143
Total NDTF Investments	$	1,615	$	43	$	3,913	$	1,316	$	74	$	3,553

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	29
Equity securities	1,593		37		2,791		1,309		54		2,484
Corporate debt securities	9		2		354		2		9		341
Municipal bonds	1		—		62		—		1		81
U.S. government bonds	11		3		509		5		8		475
Other debt securities	1		1		140		—		2		143
Total NDTF Investments	$	1,615	$	43	$	3,913	$	1,316	$	74	$	3,553

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, 2019, and 2018, were as follows.



	Three Months Ended
(in millions)	March 31, 2019		March 31, 2018
FV-NI:
Realized gains	$	23	$	10
Realized losses	21		5
AFS:
Realized gains	9		5
Realized losses	10		10

Progress Energy [Member]

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, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	59
Equity securities	1,330		28		2,270		1,093		41		1,991
Corporate debt securities	8		—		270		2		4		225
Municipal bonds	4		1		255		1		3		272
U.S. government bonds	14		2		593		9		4		601
Other debt securities	—		—		5		—		—		5
Total NDTF Investments	$	1,356	$	31	$	3,450	$	1,105	$	52	$	3,153
Other Investments
Cash and cash equivalents	$	—	$	—	$	47	$	—	$	—	$	17
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	96	$	—	$	—	$	64
Total Investments	$	1,358	$	31	$	3,546	$	1,105	$	52	$	3,217

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, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	59
Equity securities	1,330		28		2,270		1,093		41		1,991
Corporate debt securities	8		—		270		2		4		225
Municipal bonds	4		1		255		1		3		272
U.S. government bonds	14		2		593		9		4		601
Other debt securities	—		—		5		—		—		5
Total NDTF Investments	$	1,356	$	31	$	3,450	$	1,105	$	52	$	3,153
Other Investments
Cash and cash equivalents	$	—	$	—	$	47	$	—	$	—	$	17
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	96	$	—	$	—	$	64
Total Investments	$	1,358	$	31	$	3,546	$	1,105	$	52	$	3,217

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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	$	—	$	—	$	57	$	—	$	—	$	59
Equity securities	1,330		28		2,270		1,093		41		1,991
Corporate debt securities	8		—		270		2		4		225
Municipal bonds	4		1		255		1		3		272
U.S. government bonds	14		2		593		9		4		601
Other debt securities	—		—		5		—		—		5
Total NDTF Investments	$	1,356	$	31	$	3,450	$	1,105	$	52	$	3,153
Other Investments
Cash and cash equivalents	$	—	$	—	$	47	$	—	$	—	$	17
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	96	$	—	$	—	$	64
Total Investments	$	1,358	$	31	$	3,546	$	1,105	$	52	$	3,217

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, 2019, and 2018, were as follows.



	Three Months Ended
(in millions)	March 31, 2019		March 31, 2018
FV-NI:
Realized gains	$	12	$	9
Realized losses	9		8
AFS:
Realized gains	1		—
Realized losses	1		3

Duke Energy Progress [Member]

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, 2019						December 31, 2018
	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	$	—	$	—	$	43	$	—	$	—	$	46
Equity securities	1,022		20		1,812		833		30		1,588
Corporate debt securities	6		—		204		2		3		171
Municipal bonds	4		1		254		1		3		271
U.S. government bonds	10		1		422		6		3		415
Other debt securities	—		—		3		—		—		3
Total NDTF Investments	$	1,042	$	22	$	2,738	$	842	$	39	$	2,494
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	6
Total Other Investments	$	—	$	—	$	3	$	—	$	—	$	6
Total Investments	$	1,042	$	22	$	2,741	$	842	$	39	$	2,500

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, 2019						December 31, 2018
	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	$	—	$	—	$	43	$	—	$	—	$	46
Equity securities	1,022		20		1,812		833		30		1,588
Corporate debt securities	6		—		204		2		3		171
Municipal bonds	4		1		254		1		3		271
U.S. government bonds	10		1		422		6		3		415
Other debt securities	—		—		3		—		—		3
Total NDTF Investments	$	1,042	$	22	$	2,738	$	842	$	39	$	2,494
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	6
Total Other Investments	$	—	$	—	$	3	$	—	$	—	$	6
Total Investments	$	1,042	$	22	$	2,741	$	842	$	39	$	2,500

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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	$	—	$	—	$	43	$	—	$	—	$	46
Equity securities	1,022		20		1,812		833		30		1,588
Corporate debt securities	6		—		204		2		3		171
Municipal bonds	4		1		254		1		3		271
U.S. government bonds	10		1		422		6		3		415
Other debt securities	—		—		3		—		—		3
Total NDTF Investments	$	1,042	$	22	$	2,738	$	842	$	39	$	2,494
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	6
Total Other Investments	$	—	$	—	$	3	$	—	$	—	$	6
Total Investments	$	1,042	$	22	$	2,741	$	842	$	39	$	2,500

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, 2019, and 2018, were as follows.



	Three Months Ended
(in millions)	March 31, 2019		March 31, 2018
FV-NI:
Realized gains	$	10	$	8
Realized losses	8		8
AFS:
Realized gains	1		—
Realized losses	1		2

Duke Energy Florida [Member]

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, 2019						December 31, 2018
	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	$	—	$	—	$	14	$	—	$	—	$	13
Equity securities	308		8		458		260		11		403
Corporate debt securities	2		—		66		—		1		54
Municipal bonds	—		—		1		—		—		1
U.S. government bonds	4		1		171		3		1		186
Other debt securities	—		—		2		—		—		2
Total NDTF Investments^(a)	$	314	$	9	$	712	$	263	$	13	$	659
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	50	$	—	$	—	$	48
Total Investments	$	316	$	9	$	762	$	263	$	13	$	707


(a)	During the three months ended March 31, 2019, Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3 nuclear plant.

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, 2019						December 31, 2018
	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	$	—	$	—	$	14	$	—	$	—	$	13
Equity securities	308		8		458		260		11		403
Corporate debt securities	2		—		66		—		1		54
Municipal bonds	—		—		1		—		—		1
U.S. government bonds	4		1		171		3		1		186
Other debt securities	—		—		2		—		—		2
Total NDTF Investments^(a)	$	314	$	9	$	712	$	263	$	13	$	659
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	50	$	—	$	—	$	48
Total Investments	$	316	$	9	$	762	$	263	$	13	$	707


(a)	During the three months ended March 31, 2019, Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3 nuclear plant.

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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	$	—	$	—	$	14	$	—	$	—	$	13
Equity securities	308		8		458		260		11		403
Corporate debt securities	2		—		66		—		1		54
Municipal bonds	—		—		1		—		—		1
U.S. government bonds	4		1		171		3		1		186
Other debt securities	—		—		2		—		—		2
Total NDTF Investments^(a)	$	314	$	9	$	712	$	263	$	13	$	659
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Municipal bonds	2		—		49		—		—		47
Total Other Investments	$	2	$	—	$	50	$	—	$	—	$	48
Total Investments	$	316	$	9	$	762	$	263	$	13	$	707


(a)	During the three months ended March 31, 2019, Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3 nuclear plant.

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, 2019, and 2018, were as follows.



	Three Months Ended
(in millions)	March 31, 2019		March 31, 2018
FV-NI:
Realized gains	$	2	$	1
Realized losses	1		—
AFS:
Realized losses	—		1

Duke Energy Indiana [Member]

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, 2019						December 31, 2018
	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
Equity securities	$	37	$	—	$	76	$	29	$	—	$	67
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		34		—		1		33
U.S. government bonds	—		—		1		—		—		—
Total Investments	$	37	$	1	$	118	$	29	$	1	$	108

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, 2019						December 31, 2018
	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
Equity securities	$	37	$	—	$	76	$	29	$	—	$	67
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		34		—		1		33
U.S. government bonds	—		—		1		—		—		—
Total Investments	$	37	$	1	$	118	$	29	$	1	$	108

Available-for-sale 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.



	March 31, 2019						December 31, 2018
	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
Equity securities	$	37	$	—	$	76	$	29	$	—	$	67
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		34		—		1		33
U.S. government bonds	—		—		1		—		—		—
Total Investments	$	37	$	1	$	118	$	29	$	1	$	108