Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 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.

	June 30, 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	3,076		36		5,178		2,402		95		4,475
Corporate debt securities	30		1		571		4		13		566
Municipal bonds	10		—		318		1		4		353
U.S. government bonds	34		1		1,270		14		12		1,076
Other debt securities	3		1		152		—		2		148
Total NDTF Investments	$	3,153	$	39	$	7,603	$	2,421	$	126	$	6,706
Other Investments
Cash and cash equivalents	$	—	$	—	$	49	$	—	$	—	$	22
Equity securities	49		—		112		36		1		99
Corporate debt securities	2		—		60		—		2		60
Municipal bonds	3		1		90		—		1		85
U.S. government bonds	2		—		51		1		—		45
Other debt securities	—		—		65		—		1		58
Total Other Investments	$	56	$	1	$	427	$	37	$	5	$	369
Total Investments	$	3,209	$	40	$	8,030	$	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.

	June 30, 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	3,076		36		5,178		2,402		95		4,475
Corporate debt securities	30		1		571		4		13		566
Municipal bonds	10		—		318		1		4		353
U.S. government bonds	34		1		1,270		14		12		1,076
Other debt securities	3		1		152		—		2		148
Total NDTF Investments	$	3,153	$	39	$	7,603	$	2,421	$	126	$	6,706
Other Investments
Cash and cash equivalents	$	—	$	—	$	49	$	—	$	—	$	22
Equity securities	49		—		112		36		1		99
Corporate debt securities	2		—		60		—		2		60
Municipal bonds	3		1		90		—		1		85
U.S. government bonds	2		—		51		1		—		45
Other debt securities	—		—		65		—		1		58
Total Other Investments	$	56	$	1	$	427	$	37	$	5	$	369
Total Investments	$	3,209	$	40	$	8,030	$	2,458	$	131	$	7,075

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	June 30, 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	$	365	$	43	$	315	$	29	$	286	$	4
Due after one through five years	527		213		265		257		8		15
Due after five through 10 years	499		242		203		192		11		4
Due after 10 years	1,186		622		458		428		30		19
Total	$	2,577	$	1,120	$	1,241	$	906	$	335	$	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 and six months ended June 30, 2019, and 2018, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
FV-NI:
Realized gains	$	66	$	47	$	101	$	66
Realized losses	63		31		93		44
AFS:
Realized gains	47		5		57		10
Realized losses	36		12		47		25

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.

	June 30, 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	$	—	$	—	$	41	$	—	$	—	$	29
Equity securities	1,671		9		2,883		1,309		54		2,484
Corporate debt securities	18		1		360		2		9		341
Municipal bonds	2		—		63		—		1		81
U.S. government bonds	17		1		556		5		8		475
Other debt securities	3		1		141		—		2		143
Total NDTF Investments	$	1,711	$	12	$	4,044	$	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.

	June 30, 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	$	—	$	—	$	41	$	—	$	—	$	29
Equity securities	1,671		9		2,883		1,309		54		2,484
Corporate debt securities	18		1		360		2		9		341
Municipal bonds	2		—		63		—		1		81
U.S. government bonds	17		1		556		5		8		475
Other debt securities	3		1		141		—		2		143
Total NDTF Investments	$	1,711	$	12	$	4,044	$	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 and six months ended June 30, 2019, and 2018, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
FV-NI:
Realized gains	$	44	$	26	$	67	$	36
Realized losses	48		17		69		22
AFS:
Realized gains	16		4		25		9
Realized losses	11		8		21		18

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.

	June 30, 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	$	—	$	—	$	73	$	—	$	—	$	59
Equity securities	1,405		27		2,295		1,093		41		1,991
Corporate debt securities	12		—		211		2		4		225
Municipal bonds	8		—		255		1		3		272
U.S. government bonds	17		—		714		9		4		601
Other debt securities	—		—		11		—		—		5
Total NDTF Investments	$	1,442	$	27	$	3,559	$	1,105	$	52	$	3,153
Other Investments
Cash and cash equivalents	$	—	$	—	$	47	$	—	$	—	$	17
Municipal bonds	3		—		50		—		—		47
Total Other Investments	$	3	$	—	$	97	$	—	$	—	$	64
Total Investments	$	1,445	$	27	$	3,656	$	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.

	June 30, 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	$	—	$	—	$	73	$	—	$	—	$	59
Equity securities	1,405		27		2,295		1,093		41		1,991
Corporate debt securities	12		—		211		2		4		225
Municipal bonds	8		—		255		1		3		272
U.S. government bonds	17		—		714		9		4		601
Other debt securities	—		—		11		—		—		5
Total NDTF Investments	$	1,442	$	27	$	3,559	$	1,105	$	52	$	3,153
Other Investments
Cash and cash equivalents	$	—	$	—	$	47	$	—	$	—	$	17
Municipal bonds	3		—		50		—		—		47
Total Other Investments	$	3	$	—	$	97	$	—	$	—	$	64
Total Investments	$	1,445	$	27	$	3,656	$	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 and six months ended June 30, 2019, and 2018, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
FV-NI:
Realized gains	$	22	$	21	$	34	$	30
Realized losses	15		14		24		22
AFS:
Realized gains	30		1		31		1
Realized losses	25		4		26		7

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.

	June 30, 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	$	—	$	—	$	42	$	—	$	—	$	46
Equity securities	1,092		24		1,886		833		30		1,588
Corporate debt securities	12		—		211		2		3		171
Municipal bonds	8		—		255		1		3		271
U.S. government bonds	16		—		429		6		3		415
Other debt securities	—		—		11		—		—		3
Total NDTF Investments	$	1,128	$	24	$	2,834	$	842	$	39	$	2,494
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	6
Total Other Investments	$	—	$	—	$	2	$	—	$	—	$	6
Total Investments	$	1,128	$	24	$	2,836	$	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.

	June 30, 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	$	—	$	—	$	42	$	—	$	—	$	46
Equity securities	1,092		24		1,886		833		30		1,588
Corporate debt securities	12		—		211		2		3		171
Municipal bonds	8		—		255		1		3		271
U.S. government bonds	16		—		429		6		3		415
Other debt securities	—		—		11		—		—		3
Total NDTF Investments	$	1,128	$	24	$	2,834	$	842	$	39	$	2,494
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	6
Total Other Investments	$	—	$	—	$	2	$	—	$	—	$	6
Total Investments	$	1,128	$	24	$	2,836	$	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 and six months ended June 30, 2019, and 2018, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
FV-NI:
Realized gains	$	7	$	17	$	17	$	25
Realized losses	7		12		15		20
AFS:
Realized gains	1		1		2		1
Realized losses	1		3		2		5

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.

	June 30, 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	$	—	$	—	$	31	$	—	$	—	$	13
Equity securities	313		3		409		260		11		403
Corporate debt securities	—		—		—		—		1		54
Municipal bonds	—		—		—		—		—		1
U.S. government bonds	1		—		285		3		1		186
Other debt securities	—		—		—		—		—		2
Total NDTF Investments(a)	$	314	$	3	$	725	$	263	$	13	$	659
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	1
Municipal bonds	3		—		50		—		—		47
Total Other Investments	$	3	$	—	$	52	$	—	$	—	$	48
Total Investments	$	317	$	3	$	777	$	263	$	13	$	707

(a)

During the six months ended June 30, 2019, Duke Energy Florida continued to receive 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, 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	$	—	$	—	$	31	$	—	$	—	$	13
Equity securities	313		3		409		260		11		403
Corporate debt securities	—		—		—		—		1		54
Municipal bonds	—		—		—		—		—		1
U.S. government bonds	1		—		285		3		1		186
Other debt securities	—		—		—		—		—		2
Total NDTF Investments(a)	$	314	$	3	$	725	$	263	$	13	$	659
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	1
Municipal bonds	3		—		50		—		—		47
Total Other Investments	$	3	$	—	$	52	$	—	$	—	$	48
Total Investments	$	317	$	3	$	777	$	263	$	13	$	707

(a)

During the six months ended June 30, 2019, Duke Energy Florida continued to receive 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 and AFS securities for the three and six months ended June 30, 2019, and 2018, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2019		June 30, 2018		June 30, 2019		June 30, 2018
FV-NI:
Realized gains	$	15	$	4	$	17	$	5
Realized losses	8		2		9		2
AFS:
Realized gains	29		—		29		—
Realized losses	24		1		24		2

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.

	June 30, 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	$	—	$	74	$	29	$	—	$	67
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		34		—		1		33
U.S. government bonds	—		—		1		—		—		—
Total Investments	$	37	$	1	$	116	$	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.

	June 30, 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	$	—	$	74	$	29	$	—	$	67
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		34		—		1		33
U.S. government bonds	—		—		1		—		—		—
Total Investments	$	37	$	1	$	116	$	29	$	1	$	108