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Investments in Debt and Equity Securities (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Available-for-sale Securities [Line Items]

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	—	$	—	$	129	$	—	$	—	$	111
Equity securities	2,549		28		4,627		2,092		54		4,106
Corporate debt securities	16		2		600		10		8		528
Municipal bonds	5		2		334		3		10		331
U.S. government bonds	10		4		984		10		8		984
Other debt securities	—		1		120		—		3		124
Total NDTF	$	2,580	$	37	$	6,794	$	2,115	$	83	$	6,184
Other Investments
Cash and cash equivalents	$	—	$	—	$	15	$	—	$	—	$	25
Equity securities	52		—		115		38		—		104
Corporate debt securities	1		—		64		1		1		66
Municipal bonds	3		1		83		2		1		82
U.S. government bonds	—		—		44		—		1		51
Other debt securities	—		—		37		—		2		42
Total Other Investments	$	56	$	1	$	358	$	41	$	5	$	370
Total Investments	$	2,636	$	38	$	7,152	$	2,156	$	88	$	6,554

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	92
Due after one through five years	584
Due after five through 10 years	514
Due after 10 years	1,076
Total	$	2,266

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of AFS securities were as follows.



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2017		2016		2017		2016
Realized gains	$	37	$	82	$	170	$	200
Realized losses	25		42		124		134

Duke Energy Carolinas [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	—	$	—	$	34	$	—	$	—	$	18
Equity securities	1,395		14		2,553		1,157		28		2,245
Corporate debt securities	9		2		395		5		6		354
Municipal bonds	1		—		52		1		2		67
U.S. government bonds	3		3		466		2		5		458
Other debt securities	—		1		113		—		3		116
Total NDTF	$	1,408	$	20	$	3,613	$	1,165	$	44	$	3,258
Other Investments
Other debt securities	—		—		—		—		1		3
Total Investments	$	1,408	$	20	$	3,613	$	1,165	$	45	$	3,261

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	5
Due after one through five years	218
Due after five through 10 years	264
Due after 10 years	539
Total	$	1,026

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of AFS securities were as follows.



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2017		2016		2017		2016
Realized gains	$	20	$	58	$	110	$	125
Realized losses	13		28		76		84

Progress Energy [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	—	$	—	$	95	$	—	$	—	$	93
Equity securities	1,154		14		2,074		935		26		1,861
Corporate debt securities	7		—		205		5		2		174
Municipal bonds	4		2		282		2		8		264
U.S. government bonds	7		1		518		8		3		526
Other debt securities	—		—		7		—		—		8
Total NDTF	$	1,172	$	17	$	3,181	$	950	$	39	$	2,926
Other Investments
Cash and cash equivalents	$	—	$	—	$	11	$	—	$	—	$	21
Municipal bonds	3		—		47		2		—		44
Total Other Investments	$	3	$	—	$	58	$	2	$	—	$	65
Total Investments	$	1,175	$	17	$	3,239	$	952	$	39	$	2,991

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	74
Due after one through five years	309
Due after five through 10 years	194
Due after 10 years	482
Total	$	1,059

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of AFS securities were as follows.



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2017		2016		2017		2016
Realized gains	$	16	$	21	$	58	$	71
Realized losses	12		13		47		49

Duke Energy Progress [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	—	$	—	$	46	$	—	$	—	$	45
Equity securities	882		11		1,683		704		21		1,505
Corporate debt securities	5		—		144		4		1		120
Municipal bonds	4		2		281		2		8		263
U.S. government bonds	5		1		303		5		2		275
Other debt securities	—		—		4		—		—		5
Total NDTF	$	896	$	14	$	2,461	$	715	$	32	$	2,213
Other Investments
Cash and cash equivalents	$	—	$	—	$	1	$	—	$	—	$	1
Total Investments	$	896	$	14	$	2,462	$	715	$	32	$	2,214

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	16
Due after one through five years	209
Due after five through 10 years	136
Due after 10 years	371
Total	$	732

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of AFS securities were as follows.



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2017		2016		2017		2016
Realized gains	$	14	$	18	$	49	$	60
Realized losses	11		11		41		42

Duke Energy Florida [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	—	$	—	$	49	$	—	$	—	$	48
Equity securities	272		3		391		231		5		356
Corporate debt securities	2		—		61		1		1		54
Municipal bonds	—		—		1		—		—		1
U.S. government bonds	2		—		215		3		1		251
Other debt securities	—		—		3		—		—		3
Total NDTF^(a)	$	276	$	3	$	720	$	235	$	7	$	713
Other Investments
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	—	$	4
Municipal bonds	3		—		47		2		—		44
Total Other Investments	$	3	$	—	$	47	$	2	$	—	$	48
Total Investments	$	279	$	3	$	767	$	237	$	7	$	761


(a)	During the nine months ended September 30, 2017, 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.

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	58
Due after one through five years	100
Due after five through 10 years	58
Due after 10 years	111
Total	$	327

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of AFS securities were as follows.



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in millions)	2017		2016		2017		2016
Realized gains	$	2	$	3	$	9	$	11
Realized losses	1		2		6		7

Duke Energy Indiana [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in AFS securities.



	September 30, 2017						December 31, 2016
	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	$	44	$	—	$	91	$	33	$	—	$	79
Corporate debt securities	—		—		3		—		—		2
Municipal bonds	—		1		28		—		1		28
U.S. government bonds	—		—		—		—		—		1
Total Investments	$	44	$	1	$	122	$	33	$	1	$	110

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.



(in millions)	September 30, 2017
Due in one year or less	$	4
Due after one through five years	12
Due after five through 10 years	8
Due after 10 years	7
Total	$	31

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details