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Regulatory Matters (Tables)
 9 Months Ended
Sep. 30, 2014
Public Utilities, General Disclosures [Line Items]  
Schedule of Potential Plant Retirements
The table below contains the net carrying value of generating facilities planned for early retirement or being evaluated for potential retirement included in Property, plant and equipment, net on the Consolidated Balance Sheets.
 
September 30, 2014
 
Duke Energy

 
Duke Energy Carolinas(b)

 
Progress Energy

 
Duke Energy Florida(c)

 
Duke Energy Ohio(d)

 
Duke Energy Indiana(e)

Capacity (in MW)
2,297

 
200

 
873

 
873

 
556

 
668

Remaining net book value (in millions)(a)
$
256

 
$
19

 
$
109

 
$
109

 
$
9

 
$
119

(a)
Included in Property, plant and equipment, net as of September 30, 2014, on the Condensed Consolidated Balance Sheets.
(b)
Includes Lee Units 1 and 2. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. Duke Energy Carolinas expects to retire or convert these units by December 2020 in conjunction with a settlement agreement associated with the Cliffside Unit 6 air permit.
(c)
Includes Crystal River Units 1 and 2.
(d)
Includes Beckjord Units 5 and 6 and Miami Fort Unit 6. Beckjord units have no remaining book value and were retired October 1, 2014.
(e)
Includes Wabash River Units 2 through 6. Wabash River Unit 6 is being evaluated for potential conversion to gas. Duke Energy Indiana committed to retire or convert these units by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit.
Duke Energy Florida [Member]
  
Public Utilities, General Disclosures [Line Items]  
Schedule of FPSC Settlement Agreement Customer Refunds
The following table includes a summary of retail customer refunds agreed to in the 2012 Settlement and the 2013 Settlement. Refer to the 2013 Annual Report on Form 10-K for additional information on each of these refunds.
 
September 30, 2014
 
 
 
 
 
Remaining Amount to be Refunded
(in millions)
Total

 
Refunded to date

 
2014

 
2015

 
2016

2012 Settlement refund
$
288

 
$
233

 
$
35

 
$
10

 
$
10

Retirement decision refund
100

 
—

 
—

 
40

 
60

NEIL proceeds
490

 
449

 
41

 
—

 
—

Total customer refunds
$
878

 
682

 
76

 
50

 
70

Accelerated regulatory asset recovery
(130
)
 
(28
)
 
(9
)
 
(37
)
 
(56
)
Net customer refunds
$
748

 
$
654

 
$
67

 
$
13

 
$
14
Duke Energy Ohio [Member]
  
Public Utilities, General Disclosures [Line Items]  
Schedule of MISO Exit Fee Obligations
The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded obligations related to its withdrawal from MISO. As of September 30, 2014, $74 million is recorded as a Regulatory asset on Duke Energy Ohio's Condensed Consolidated Balance Sheets.
(in millions)
December 31, 2013

 
Provision /
Adjustments

 
Cash
Reductions

 
September 30, 2014

Duke Energy Ohio
$
95

 
$
3

 
$
(3
)
 
$
95