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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 10. See Note 11 for additional information related to investments by major security type for the Duke Energy Registrants.
 
March 31, 2019
(in millions)
Total Fair Value

Level 1

Level 2

Level 3

Not Categorized

NDTF equity securities
$
5,061

$
4,998

$

$

$
63

NDTF debt securities
2,302

630

1,672



Other equity securities
112

112




Other debt securities
310

103

207



Derivative assets
35

2

27

6


Total assets
7,820

5,845

1,906

6

63

Derivative liabilities
(244
)
(23
)
(100
)
(121
)

Net assets (liabilities)
$
7,576

$
5,822

$
1,806

$
(115
)
$
63

 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

Level 3

Not Categorized

NDTF equity securities
$
4,475

$
4,410

$

$

$
65

NDTF debt securities
2,231

576

1,655



Other equity securities
99

99




Other debt securities
270

67

203



Derivative assets
57

4

25

28


Total assets
7,132

5,156

1,883

28

65

Derivative liabilities
(242
)
(11
)
(90
)
(141
)

Net assets (liabilities)
$
6,890

$
5,145

$
1,793

$
(113
)
$
65

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
 
Derivatives (net)
 
Three Months Ended March 31,
(in millions)
2019

 
2018

Balance at beginning of period
$
(113
)
 
$
(114
)
Purchases, sales, issuances and settlements:
 
 
 
Settlements
(12
)
 
(14
)
Total gains included on the Condensed Consolidated Balance Sheet
10

 
4

Balance at end of period
$
(115
)
 
$
(124
)
Quantitative Information Table - Level 3
The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
 
March 31, 2019
 
Fair Value
 
 
 
 
 
Investment Type
(in millions)
Valuation Technique
Unobservable Input
Range
Duke Energy Ohio
 

 
 
 
 
 
FTRs
$
1

RTO auction pricing
FTR price – per MWh
$
0.17

-
$
2.40

Duke Energy Indiana
 

 
 
 
 
 
FTRs
5

RTO auction pricing
FTR price – per MWh
(0.42
)
-
7.85

Piedmont
 
 
 
 
 
 
Natural gas contracts
(121
)
Discounted cash flow
Forward natural gas curves – price per MMBtu
2.03

-
3.15

Duke Energy
 
 
 
 
 
 
Total Level 3 derivatives
$
(115
)
 
 
 
 
 
 
December 31, 2018
 
Fair Value
 
 
 
 
 
Investment Type
(in millions)
Valuation Technique
Unobservable Input
Range
Duke Energy Ohio
 

 
 
 
 
 
FTRs
$
6

RTO auction pricing
FTR price – per MWh
$
1.19

-
$
4.59

Duke Energy Indiana
 

 
 
 
 
 
FTRs
22

RTO auction pricing
FTR price – per MWh
(2.07
)
-
8.27

Piedmont
 
 
 
 
 
 
Natural gas contracts
(141
)
Discounted cash flow
Forward natural gas curves – price per MMBtu
1.87

-
2.95

Duke Energy
 
 
 
 
 
 
Total Level 3 derivatives
$
(113
)
 
 
 
 
 
Schedule Of Long Term Debt Fair Value
The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.
 
March 31, 2019
 
December 31, 2018
(in millions)
Book Value

 
Fair Value

 
Book Value

 
Fair Value

Duke Energy(a)
$
56,182

 
$
58,242

 
$
54,529

 
$
54,534

Duke Energy Carolinas
10,965

 
11,951

 
10,939

 
11,471

Progress Energy
19,251

 
20,942

 
18,911

 
19,885

Duke Energy Progress
9,048

 
9,469

 
8,204

 
8,300

Duke Energy Florida
7,265

 
8,000

 
7,321

 
7,742

Duke Energy Ohio
2,960

 
3,149

 
2,165

 
2,239

Duke Energy Indiana
3,722

 
4,242

 
3,782

 
4,158

Piedmont
2,138

 
2,243

 
2,138

 
2,180


(a)
Book value of long-term debt includes $1.5 billion as of March 31, 2019, and $1.6 billion as of December 31, 2018, of unamortized debt discount and premium, net in purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.
Duke Energy Carolinas [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
(in millions)
Total Fair Value

Level 1

Level 2

Not Categorized

NDTF equity securities
$
2,791

$
2,728

$

$
63

NDTF debt securities
1,122

212

910


Derivative assets
5


5


Total assets
3,918

2,940

915

63

Derivative liabilities
(39
)

(39
)

Net assets
$
3,879

$
2,940

$
876

$
63

 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

Not Categorized

NDTF equity securities
$
2,484

$
2,419

$

$
65

NDTF debt securities
1,069

149

920


Derivative assets
3


3


Total assets
3,556

2,568

923

65

Derivative liabilities
(33
)

(33
)

Net assets
$
3,523

$
2,568

$
890

$
65

Progress Energy [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

 
Total Fair Value

Level 1

Level 2

NDTF equity securities
$
2,270

$
2,270

$

 
$
1,991

$
1,991

$

NDTF debt securities
1,180

418

762

 
1,162

427

735

Other debt securities
96

47

49

 
64

17

47

Derivative assets
8


8

 
4


4

Total assets
3,554

2,735

819

 
3,221

2,435

786

Derivative liabilities
(44
)

(44
)
 
(44
)

(44
)
Net assets
$
3,510

$
2,735

$
775

 
$
3,177

$
2,435

$
742

Duke Energy Progress [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

 
Total Fair Value

Level 1

Level 2

NDTF equity securities
$
1,812

$
1,812

$

 
$
1,588

$
1,588

$

NDTF debt securities
926

298

628

 
906

294

612

Other debt securities
3

3


 
6

6


Derivative assets
8


8

 
4


4

Total assets
2,749

2,113

636

 
2,504

1,888

616

Derivative liabilities
(12
)

(12
)
 
(27
)

(27
)
Net assets
$
2,737

$
2,113

$
624

 
$
2,477

$
1,888

$
589

Duke Energy Florida [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

 
Total Fair Value

Level 1

Level 2

NDTF equity securities
$
458

$
458

$

 
$
403

$
403

$

NDTF debt securities
254

120

134

 
256

133

123

Other debt securities
50

1

49

 
48

1

47

Total assets
762

579

183

 
707

537

170

Derivative liabilities
(18
)

(18
)
 
(9
)

(9
)
Net assets
$
744

$
579

$
165

 
$
698

$
537

$
161

Duke Energy Ohio [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets were not material for the three months ended March 31, 2019, and 2018.
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
Duke Energy Indiana [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 2

Level 3

 
Total Fair Value

Level 1

Level 2

Level 3

Other equity securities
$
76

$
76

$

$

 
$
67

$
67

$

$

Other debt securities
42


42


 
41


41


Derivative assets
5



5

 
23

1


22

Total assets
$
123

$
76

$
42

$
5

 
$
131

$
68

$
41

$
22


Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
 
Derivatives (net)
 
Three Months Ended March 31,
(in millions)
2019

 
2018

Balance at beginning of period
$
22

 
$
27

Purchases, sales, issuances and settlements:
 
 
 
Settlements
(10
)
 
(14
)
Total losses included on the Condensed Consolidated Balance Sheet
(7
)
 
(6
)
Balance at end of period
$
5

 
$
7

Piedmont Natural Gas [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurement Amounts For Assets And Liabilities
The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets.
 
March 31, 2019
 
December 31, 2018
(in millions)
Total Fair Value

Level 1

Level 3

 
Total Fair Value

Level 1

Level 3

Derivative assets
$
2

$
2

$

 
$
3

3


Derivative liabilities
(121
)

(121
)
 
(141
)

(141
)
Net (liabilities) assets
$
(119
)
$
2

$
(121
)
 
$
(138
)
$
3

$
(141
)

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
 
Derivatives (net)
 
Three Months Ended March 31,
(in millions)
2019

 
2018

Balance at beginning of period
$
(141
)
 
$
(142
)
Total gains and settlements
20

 
10

Balance at end of period
$
(121
)
 
$
(132
)