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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment information
An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the three months ended March 31, 2016 and 2015 is as follows:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
Analysis and reconciliation of reportable segment revenues for Generation
_________
(a)
Generation includes the six power marketing reportable segments shown below: Mid-Atlantic, Midwest, New England, New York, ERCOT and Other Power Regions. Intersegment revenues for Generation for the three months ended March 31, 2016 include revenue from sales to PECO of $79 million and sales to BGE of $173 million in the Mid-Atlantic region, and sales to ComEd of $5 million in the Midwest region. For the three months ended March 31, 2015, intersegment revenues for Generation include revenue from sales to PECO of $63 million and sales to BGE of $138 million in the Mid-Atlantic region, and sales to ComEd of $9 million in the Midwest region. For the Successor period of March 24, 2016 to March 31, 2016, intersegment revenues for Generation include revenue from sales to Pepco of $6 million, sales to DPL of $4 million, and sales to ACE of $1 million in the Mid-Atlantic region.
(b)
Amounts included represent activity for the PHI's successor period, March 24, 2016 through March 31, 2016. PHI includes the three reportable segments: Pepco, DPL and ACE. See tables below for PHI's predecessor periods, including Pepco, DPL and ACE, for January 1, 2016 to March 23, 2016 and for the three months ended March 31, 2015.
(c)
Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.
(d)
Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses on the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 19 — Supplemental Financial Information for total utility taxes for the three months ended March 31, 2016 and 2015.
(e)
Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with Generation’s sale of certain products and services by and between Exelon’s segments is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. For Exelon, these amounts are included in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income.


Generation total revenues:

 
Three Months Ended March 31, 2016
 
Three Months Ended March 31, 2015
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
 
Revenues
from external
customers(a)(c)
 
Intersegment
revenues(c)
 
Total
Revenues(c)
Mid-Atlantic
$
1,532

 
$
(12
)
 
$
1,520

 
$
1,556

 
$
(43
)
 
$
1,513

Midwest
1,089

 
6

 
1,095

 
1,276

 
—

 
1,276

New England
471

 
(1
)
 
470

 
865

 
(6
)
 
859

New York
218

 
(15
)
 
203

 
307

 
3

 
310

ERCOT
163

 
—

 
163

 
181

 
(1
)
 
180

Other Power Regions
222

 
1

 
223

 
212

 
2

 
214

Total Revenues for Reportable Segments
3,695


(21
)

3,674


4,397


(45
)

4,352

Other(b)
1,044

 
21

 
1,065

 
1,443

 
45

 
1,488

Total Generation Consolidated Operating Revenues
$
4,739


$
—


$
4,739


$
5,840


$
—


$
5,840

 __________
(a)
Includes all wholesale and retail electric sales to third parties and affiliated sales to the Utility Registrants.
(b)
Other represents activities not allocated to a region. See text above for a description of included activities. Also includes a $20 million and $40 million increase to revenues for the amortization of intangible assets related to commodity contracts recorded at fair value for the three months ended March 31, 2016 and 2015, respectively, unrealized mark-to-market gains of $63 million and $154 million for the three months ended March 31, 2016 and 2015, respectively, and elimination of intersegment revenues.
(c)
Exelon corrected an error in the March 31, 2015 balances within Intersegment Revenue and Revenue from external customers for an overstatement of $43 million of Intersegment Revenue for Reportable Segments for the three months ended March 31, 2015, an understatement of Revenue from external customers for Reportable Segments of $43 million for the three months ended March 31, 2015, an understatement of $43 million of Intersegment Revenue for Other for the three months ended March 31, 2015, and an overstatement of Revenue from external customers for Other of $43 million for the three months ended March 31, 2015. This error is not considered material to any prior period, and there is no impact to Total Revenues.


Generation total revenues net of purchased power and fuel expense:

 
Three Months Ended March 31, 2016
 
Three Months Ended March 31, 2015
 
RNF
from external
customers(a)
 
Intersegment
RNF
 
Total
RNF
 
RNF
from external
customers(a)(c)
 
Intersegment
RNF(c)
 
Total
RNF(c)
Mid-Atlantic
$
832

 
$
9

 
$
841

 
$
808

 
$
(21
)
 
$
787

Midwest
715

 
3

 
718

 
709

 
(6
)
 
703

New England
86

 
(5
)
 
81

 
182

 
(24
)
 
158

New York
141

 
(11
)
 
130

 
169

 
20

 
189

ERCOT
81

 
(20
)
 
61

 
88

 
(33
)
 
55

Other Power Regions
86

 
(10
)
 
76

 
72

 
(26
)
 
46

Total Revenues net of purchased power and fuel expense for Reportable Segments
1,941


(34
)

1,907


2,028


(90
)

1,938

Other(b)
356

 
34

 
390

 
379

 
90

 
469

Total Generation Revenues net of purchased power and fuel expense
$
2,297


$
—


$
2,297


$
2,407


$
—


$
2,407
Exelon Generation Co L L C [Member]  
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment revenues for Generation