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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment information
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Analysis and reconciliation of reportable segment revenues for Generation
_________
(a)
Generation includes the six 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, 2017 include revenue from sales to PECO of $45 million, sales to BGE of $134 million, sales to Pepco of $83 million, sales to DPL of $51 million, and sales to ACE of $9 million in the Mid-Atlantic region, and sales to ComEd of $5 million in the Midwest region. For the three months ended March 31, 2016, intersegment revenues for Generation 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 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 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, 2016.
(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 18 — Supplemental Financial Information for total utility taxes for the three months ended March 31, 2017 and 2016.
(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.

Successor and Predecessor PHI:

 
Pepco
 
DPL
 
ACE
 
Other(b)
 
Intersegment
Eliminations
 
PHI
Operating revenues(a):
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
530

 
$
296

 
$
275

 
$
—

 
$
(4
)
 
$
1,097

Rate-regulated natural gas revenues
—

 
66

 
—

 
—

 
—

 
66

Shared service and other revenues
—

 
—

 
—

 
12

 
—

 
12

March 24, 2016 to March 31, 2016 - Successor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
40

 
$
24

 
$
23

 
$
3

 
$
—

 
$
90

Rate-regulated natural gas revenues
—

 
3

 
—

 
—

 
—

 
3

Shared service and other revenues
—

 
—

 
—

 
12

 
—

 
12

January 1, 2016 to March 23, 2016 - Predecessor
 
 
 
 
 
 
 
 
 
 
 
Rate-regulated electric revenues
$
511

 
$
279

 
$
268

 
$
42

 
$
(4
)
 
$
1,096

Rate-regulated natural gas revenues
—

 
56

 
—

 
1

 
—

 
57

Shared service and other revenues
—

 
—

 
—

 
—

 
—

 
—

Intersegment revenues:
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017 - Successor
$
1

 
$
2

 
$
1

 
$
13

 
$
(5
)
 
$
12

March 24, 2016 to March 31, 2016 - Successor
—

 
—

 
—

 
12

 
—

 
12

January 1, 2016 to March 23, 2016 - Predecessor
1

 
2

 
1

 
—

 
(4
)
 
—

Net income (loss):
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017 - Successor
$
58

 
$
57

 
$
28

 
$
(15
)
 
$
12

 
$
140

March 24, 2016 to March 31, 2016 - Successor
(140
)
 
(98
)
 
(105
)
 
22

 
12

 
(309
)
January 1, 2016 to March 23, 2016 - Predecessor
32

 
26

 
5

 
(44
)
 
—

 
19

Total assets:
 
 
 
 
 
 
 
 
 
 
 
March 31, 2017 - Successor
$
7,417

 
$
4,191

 
$
3,451

 
$
10,785

 
$
(4,826
)
 
$
21,018

December 31, 2016 - Successor
7,335

 
4,153

 
3,457

 
10,804

 
(4,724
)
 
21,025

_________
(a)
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 18 — Supplemental Financial Information for total utility taxes for the three months ended March 31, 2017 and 2016.
(b)
Other primarily includes PHI’s corporate operations, shared service entities and other financing and investment activities.  For the predecessor periods presented, Other includes the activity of PHI’s unregulated businesses which were distributed to Exelon and Generation as a result of the PHI Merger. 







Generation total revenues:

 
Three Months Ended March 31, 2017
 
Three Months Ended March 31, 2016
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
 
Revenues
from external
customers(a)
 
Intersegment
revenues
 
Total
Revenues
Mid-Atlantic
$
1,429

 
$
(4
)
 
$
1,425

 
$
1,532

 
$
(12
)
 
$
1,520

Midwest
1,051

 
2

 
1,053

 
1,089

 
6

 
1,095

New England
549

 
(2
)
 
547

 
471

 
(1
)
 
470

New York
310

 
(3
)
 
307

 
218

 
(15
)
 
203

ERCOT
192

 
(1
)
 
191

 
163

 
—

 
163

Other Power Regions
189

 
(5
)
 
184

 
222

 
1

 
223

Total Revenues for Reportable Segments
3,720


(13
)

3,707


3,695


(21
)

3,674

Other(b)
1,168

 
13

 
1,181

 
1,044

 
21

 
1,065

Total Generation Consolidated Operating Revenues
$
4,888


$
—


$
4,888


$
4,739


$
—


$
4,739

 __________
(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. Includes a $3 million decrease to revenues and a $20 million increase to revenues for the amortization of intangible assets and liabilities related to commodity contracts recorded at fair value for the three months ended March 31, 2017 and 2016, respectively, unrealized mark-to-market gains of $44 million and $63 million for the three months ended March 31, 2017 and 2016, respectively, and elimination of intersegment revenues.

Generation total revenues net of purchased power and fuel expense:
Exelon Generation Co L L C [Member]  
Segment Reporting Information [Line Items]  
Analysis and reconciliation of reportable segment revenues for Generation