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Derivative Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of the derivative fair value
The following table provides a summary of the derivative fair value balances recorded by the Registrants as of June 30, 2016:
 
 
 
 
 
 
 
 
Successor
 
 
 
 
Generation
 
ComEd
 
DPL
 
PHI
 
Exelon
Derivatives
 
Economic
Hedges
 
Proprietary
Trading
 
Collateral
and
Netting(a)
 
Subtotal(b)
 
Economic
Hedges(c)
 
Economic
Hedges(d)
 
Collateral
and
Netting(a)
 
Subtotal
 
Subtotal
 
Total
Derivatives
Mark-to-market derivative assets (current assets)
 
$
4,089

 
$
99

 
$
(3,438
)
 
$
750

 
$
—

 
$
1

 
$
(1
)
 
$
—

 
$
—

 
$
750

Mark-to-market derivative assets (noncurrent assets)
 
1,846

 
28

 
(1,382
)
 
492

 
—

 
—

 
—

 
—

 
—

 
492

Total mark-to-market derivative assets
 
5,935


127

 
(4,820
)
 
1,242

 
—

 
1

 
(1
)
 
—


—

 
1,242

Mark-to-market derivative liabilities (current liabilities)
 
(3,797
)
 
(94
)
 
3,766

 
(125
)
 
(18
)
 
—

 
—

 
—

 
—

 
(143
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
(1,761
)
 
(37
)
 
1,575

 
(223
)
 
(203
)
 
—

 
—

 
—

 
—

 
(426
)
Total mark-to-market derivative liabilities
 
(5,558
)
 
(131
)
 
5,341

 
(348
)
 
(221
)
 
—

 
—

 
—


—

 
(569
)
Total mark-to-market derivative net assets (liabilities)
 
$
377

 
$
(4
)
 
$
521

 
$
894

 
$
(221
)
 
$
1

 
$
(1
)
 
$
—


$
—

 
$
673

______
(a)
Exelon, Generation, PHI and DPL net all available amounts allowed under the derivative accounting guidance on the balance sheet. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases Exelon and Generation may have other offsetting exposures, subject to a master netting or similar agreement, such as trade receivables and payables, transactions that do not qualify as derivatives, letters of credit and other forms of non-cash collateral. These are not reflected in the table above.
(b)
Current and noncurrent assets are shown net of collateral of $159 million and $88 million, respectively, and current and noncurrent liabilities are shown net of collateral of $170 million and $104 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $521 million at June 30, 2016.
(c)
Includes current and noncurrent liabilities relating to floating-to-fixed energy swap contracts with unaffiliated suppliers.
(d)
Represents natural gas futures purchased by DPL as part of a natural gas hedging program approved by the DPSC.

The following table provides a summary of the derivative fair value balances recorded by the Registrants as of December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Predecessor
 
 
Generation
 
ComEd
 
Exelon
 
DPL
 
PHI Corporate
 
PHI
Description
 
Economic
Hedges
 
Proprietary
Trading
 
Collateral
and
Netting(a)
 
Subtotal(b)
 
Economic
Hedges(c)
 
Total
Derivatives
 
Economic
Hedges(e)
 
Collateral and
Netting(a)
 
Subtotal
 
Other(d)
 
Total
Derivatives
Mark-to-market derivative assets (current assets)
 
$
5,236

 
$
108

 
$
(3,994
)
 
$
1,350

 
$
—

 
$
1,350

 
$
—

 
$
—

 
$
—

 
$
18

 
$
18

Mark-to-market derivative assets (noncurrent assets)
 
1,860

 
22

 
(1,163
)
 
719

 
—

 
719

 
—

 
—

 
—

 
—

 
—

Total mark-to-market derivative assets
 
7,096

 
130

 
(5,157
)
 
2,069

 
—

 
2,069

 
—

 
—

 
—

 
18

 
18

Mark-to-market derivative liabilities (current liabilities)
 
(4,907
)
 
(94
)
 
4,827

 
(174
)
 
(23
)
 
(197
)
 
(2
)
 
2

 
—

 
—

 
—

Mark-to-market derivative liabilities (noncurrent liabilities)
 
(1,673
)
 
(33
)
 
1,564

 
(142
)
 
(224
)
 
(366
)
 
—

 
—

 
—

 
—

 
—

Total mark-to-market derivative liabilities
 
(6,580
)
 
(127
)
 
6,391

 
(316
)
 
(247
)
 
(563
)
 
(2
)
 
2

 
—

 
—

 
—

Total mark-to-market derivative net assets (liabilities)
 
$
516

 
$
3

 
$
1,234

 
$
1,753

 
$
(247
)
 
$
1,506

 
$
(2
)
 
$
2

 
$
—

 
$
18


$
18

________ 
(a)
Exelon, Generation, PHI and DPL net all available amounts allowed under the derivative accounting guidance on the balance sheet. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases Exelon and Generation may have other offsetting exposures, subject to a master netting or similar agreement, such as trade receivables and payables, transactions that do not qualify as derivatives, and letters of credit and other forms of non-cash collateral. These are not reflected in the table above.
(b)
Current and noncurrent assets are shown net of collateral of $352 million and $180 million, respectively, and current and noncurrent liabilities are shown net of collateral of $480 million and $222 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $1,234 million at December 31, 2015.
(c)
Includes current and noncurrent liabilities relating to floating-to-fixed energy swap contracts with unaffiliated suppliers.
June 30, 2016.
 
 
 
Generation
 
Exelon Corporate
 
Exelon
Description
 
Derivatives
Designated
as Hedging
Instruments
 
Economic
Hedges
 
Proprietary
Trading(a)
 
Collateral
and
Netting(b)
 
Subtotal
 
Derivatives
Designated
as Hedging
Instruments
 
Total
Mark-to-market derivative assets (current assets)
 
$
—

 
$
14

 
$
6

 
$
(11
)
 
$
9

 
$
—

 
$
9

Mark-to-market derivative assets (noncurrent assets)
 
—

 
14

 
5

 
(12
)
 
7

 
47

 
54

Total mark-to-market derivative assets
 
—

 
28

 
11

 
(23
)
 
16

 
47

 
63

Mark-to-market derivative liabilities (current liabilities)
 
(8
)
 
(9
)
 
(4
)
 
12

 
(9
)
 
—

 
(9
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
(13
)
 
(10
)
 
(5
)
 
14

 
(14
)
 
(2
)
 
(16
)
Total mark-to-market derivative liabilities
 
(21
)
 
(19
)
 
(9
)
 
26

 
(23
)
 
(2
)
 
(25
)
Total mark-to-market derivative net assets (liabilities)
 
$
(21
)
 
$
9

 
$
2

 
$
3

 
$
(7
)
 
$
45

 
$
38

 _________
(a)
Generation enters into interest rate derivative contracts to economically hedge risk associated with the interest rate component of commodity positions. The characterization of the interest rate derivative contracts between the proprietary trading activity in the above table is driven by the corresponding characterization of the underlying commodity position that gives rise to the interest rate exposure. Generation does not utilize proprietary trading interest rate derivatives with the objective of benefiting from shifts or changes in market interest rates.
(b)
Exelon and Generation net all available amounts allowed under the derivative accounting guidance on the balance sheet. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases Exelon and Generation may have other offsetting exposures, subject to a master netting or similar agreement, such as accrued interest, transactions that do not qualify as derivatives, letters of credit and other forms of non-cash collateral. These are not reflected in the table above.

The following table provides a summary of the interest rate and foreign exchange hedge balances recorded by the Registrants as of December 31, 2015:
 
 
Generation
 
Exelon Corporate
 
Exelon
Description
 
Derivatives
Designated
as Hedging
Instruments
 
Economic
Hedges
 
Proprietary
Trading(a)
 
Collateral
and
Netting(b)
 
Subtotal
 
Derivatives
Designated
as Hedging
Instruments
 
Total
Mark-to-market derivative assets (current assets)
 
$
—

 
$
10

 
$
10

 
$
(5
)
 
$
15

 
$
—

 
$
15

Mark-to-market derivative assets (noncurrent assets)
 
—

 
10

 
5

 
(1
)
 
14

 
25

 
39

Total mark-to-market derivative assets
 
—

 
20

 
15

 
(6
)
 
29

 
25

 
54

Mark-to-market derivative liabilities (current liabilities)
 
(8
)
 
(2
)
 
(9
)
 
11

 
(8
)
 
—

 
(8
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
(8
)
 
(1
)
 
(3
)
 
4

 
(8
)
 
—

 
(8
)
Total mark-to-market derivative liabilities
 
(16
)
 
(3
)
 
(12
)
 
15

 
(16
)
 
—

 
(16
)
Total mark-to-market derivative net assets (liabilities)
 
$
(16
)
 
$
17

 
$
3

 
$
9

 
$
13

 
$
25

 
$
38

__________
(a)
Generation enters into interest rate derivative contracts to economically hedge risk associated with the interest rate component of commodity positions. The characterization of the interest rate derivative contracts between the proprietary trading activity in the above table is driven by the corresponding characterization of the underlying commodity position that gives rise to the interest rate exposure. Generation does not utilize proprietary trading interest rate derivatives with the objective of benefiting from shifts or changes in market interest rates.
(b)
Exelon includes the gain or loss on the hedged items and the offsetting loss or gain on the related interest rate swaps in interest expense as follows:
  
 
 
Three Months Ended June 30,
 
Income Statement
Location
 
2016
 
2015
 
2016
 
2015
  
 
Gain (loss) on Swaps
 
Gain (loss) on Borrowings
Exelon
Interest expense
 
$
5

 
$
(11
)
 
$
(1
)
 
$
16

 
 
 
 
 
 
 
 
 
 
  
 
 
Six Months Ended June 30,
 
Income Statement
Location
 
2016
 
2015
 
2016
 
2015
  
 
Gain (loss) on Swaps
 
Gain (loss) on Borrowings
Generation
Interest expense(a)
 
$
—

 
$
(1
)
 
$
—

 
$
—

Exelon
Interest expense
 
22

 
(1
)
 
(16
)
 
9

__________
(a)
For the six months ended June 30, 2015, the loss on Generation swaps included $1 million realized in earnings with an immaterial amount excluded from hedge effectiveness testing.
The activity of accumulated OCI related to cash flow hedges
amounts reclassified from AOCI, when combined with the impacts of the hedged transactions, result in the ultimate recognition of net revenues or expenses at the contractual price.
 
 
 
 
 
 
 
 
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax                   
 
Generation
 
Exelon
 
Three Months Ended June 30, 2016
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
AOCI derivative loss at March 31, 2016
 
 
 
$
(26
)
 
$
(26
)
 
Reclassifications from AOCI to net income
 
Interest expense
 
1

 
—

 
AOCI derivative loss at June 30, 2016
 
 
 
$
(25
)
 
$
(26
)
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax                   
Generation
 
Exelon
 
Six Months Ended June 30, 2016
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
Accumulated OCI derivative loss at December 31, 2015
 
 
 
$
(21
)
 
$
(19
)
 
Effective portion of changes in fair value
 
 
 
(1
)
  
(4
)
 
Reclassifications from AOCI to net income
 
Interest Expense
 
(3
)
(a)  
(3
)
(a)  
Accumulated OCI derivative loss at June 30, 2016
 
 
 
$
(25
)
 
$
(26
)
 
 
 
 
 
 
 
 
 
 
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax                   
 
 
Generation
 
Exelon
 
Three Months Ended June 30, 2015
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
AOCI derivative loss at March 31, 2015
 
 
 
$
(23
)
 
$
(22
)
 
Effective portion of changes in fair value
 
 
 
—

  
1

 
Reclassifications from AOCI to net income
 
Interest Expense
 
2

 
2

 
AOCI derivative loss at June 30, 2015
 
 
 
$
(21
)
 
$
(19
)
 
 
 
Total Cash Flow Hedge OCI Activity,
Net of Income Tax                   
 
Generation
 
Exelon
 
Six Months Ended June 30, 2015
 
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash
Flow Hedges
 
Accumulated OCI derivative loss at December 31, 2014
 
 
 
$
(18
)
 
$
(28
)
 
Effective portion of changes in fair value
 
 
 
(6
)
  
(10
)
 
Reclassifications from AOCI to net income
 
Other, net
 
—

 
16

(b) 
Reclassifications from AOCI to net income
 
Interest Expense
 
5

 
5

  
Reclassifications from AOCI to net income
 
Operating Revenues
 
(2
)
 
(2
)
 
Accumulated OCI derivative loss at June 30, 2015
 
 
 
$
(21
)
 
$
(19
)
 

__
Other Derivatives - Gain (loss) and reclassification
the tables below, “Change in fair value” represents the change in fair value of the derivative contracts held at the reporting date. The “Reclassification to realized at settlement” represents the recognized change in fair value that was reclassified to realized due to settlement of the derivative during the period.
  
 
Three Months Ended June 30,
 
Six Months Ended June 30,
  
 
2016
 
2015
 
2016
 
2015
Change in fair value of commodity positions
 
$
5

 
$
7

 
$
14

 
$
8

Reclassification to realized at settlement of commodity positions
 
(5
)
 
(7
)
 
(11
)
 
(5
)
Net commodity mark-to-market gains (losses)
 
—

 
—

 
3

 
3

Change in fair value of treasury positions
 
—

 
—

 
(2
)
 
4

Reclassification to realized at settlement of treasury positions
 
(1
)
 
(2
)
 
1

 
(6
)
Net treasury mark-to-market gains (losses)
 
(1
)
 
(2
)
 
(1
)
 
(2
)
Total net mark-to-market gains (losses)
 
$
(1
)
 
$
(2
)
 
$
2

 
$
1

Cr
 
 
Generation
 
Exelon
Six Months Ended June 30, 2016
Operating
Revenues
 
Purchased
Power 
and Fuel
 
Total
 
Total
Change in fair value of commodity positions
$
(153
)
 
$
109

 
$
(44
)
 
$
(44
)
Reclassification to realized at settlement of commodity positions
(392
)
 
243

 
(149
)
 
(149
)
Net commodity mark-to-market gains (losses)
(545
)
 
352

 
(193
)
 
(193
)
Change in fair value of treasury positions
(4
)
 
—

 
(4
)
 
(4
)
Reclassification to realized at settlement of treasury positions
(4
)
 
—

 
(4
)
 
(4
)
Net treasury mark-to-market gains (losses)
(8
)
 
—

 
(8
)
 
(8
)
     Net mark-to-market gains (losses)
$
(553
)
 
$
352

 
$
(201
)
 
$
(201
)

 
 
 
 
 
 
 
 
 
 
 
Generation
 
Exelon Corporate
 
Exelon
Three Months Ended June 30, 2015
Operating
Revenues
 
Purchased
Power
and Fuel
 
Total
 
Interest
Expense
 
Total
Change in fair value of commodity positions
$
197

 
$
110

 
$
307

 
$
—

 
$
307

Reclassification to realized at settlement of commodity positions
(167
)
 
100

 
(67
)
 
—

 
(67
)
Net commodity mark-to-market gains (losses)
30

 
210

 
240

 
—

 
240

Change in fair value of treasury positions
(3
)
 
—

 
(3
)
 
114

 
111

Reclassification to realized at settlement of treasury positions
(2
)
 
—

 
(2
)
 
64

 
62

Net treasury mark-to-market gains (losses)
(5
)
 
—

 
(5
)
 
178

 
173

     Net mark-to-market gains (losses)
$
25

 
$
210

 
$
235

 
$
178

 
$
413

 

 
Generation
 
Exelon Corporate
 
Exelon
Six Months Ended June 30, 2015
Operating
Revenues
 
Purchased
Power
and Fuel
 
Total
 
Interest
Expense
 
Total
Change in fair value of commodity positions
$
377

 
$
15

 
$
392

 
$
—

 
$
392

Reclassification to realized at settlement of commodity positions
(204
)
 
203

 
(1
)
 
—

 
(1
)
Net commodity mark-to-market gains (losses)
173

 
218

 
391

 
—

 
391

Change in fair value of treasury positions
10

 
—

 
10

 
36

 
46

Reclassification to realized at settlement of treasury positions
(4
)
 
—

 
(4
)
 
64

 
60

Net treasury mark-to-market gains (losses)
6

 
—

 
6

 
100

 
106

      Net mark-to-market gains (losses)
$
179

 
$
218

 
$
397

 
$
100

 
$
497

Prop
Schedule of Derivative Instruments [Table Text Block]
e
Information on Generation's credit exposure for all derivative instruments, normal purchase normal sales, and applicable payables and receivables, net of collateral and instruments that are subject to master netting agreements
following tables provide information on Generation’s credit exposure for all derivative instruments, NPNS and applicable payables and receivables, net of collateral and instruments that are subject to master netting agreements, as of June 30, 2016. The tables further delineate that exposure by credit rating of the counterparties and provide guidance on the concentration of credit risk to individual counterparties. The figures in the tables below exclude credit risk exposure from individual retail counterparties, Nuclear fuel procurement contracts and exposure through RTOs, ISOs, NYMEX, ICE and Nodal commodity exchanges, further discussed in ITEM 3. — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK. Additionally, the figures in the tables below exclude exposures with affiliates, including net receivables with ComEd, PECO, BGE, Pepco, DPL and ACE of $26 million, $40 million,$36 million, $50 million, $15 million, and $8 million as of June 30, 2016, respectively.
 
Rating as of June 30, 2016
Total Exposure Before Credit Collateral
 
Credit Collateral(a)
 
Net Exposure
 
Number of Counterparties Greater than 10% of Net Exposure
 
Net Exposure of Counterparties Greater than 10% of Net Exposure
Investment grade
$
965

 
$
12

 
$
953

 
1

 
$
356

Non-investment grade
55

 
24

 
31

 
—

 
—

No external ratings
 
 
 
 
 
 
 
 
 
Internally rated — investment grade
373

 
1

 
372

 
—

 
—

Internally rated — non-investment grade
46

 
7

 
39

 
—

 
—

Total
$
1,439

 
$
44

 
$
1,395

 
1

 
$
356

 
Net Credit Exposure by Type of Counterparty
As of June 30, 2016
Financial institutions
$
96

Investor-owned utilities, marketers, power producers
573

Energy cooperatives and municipalities
696

Other
30

Total
$
1,395

_____ 
(a)
As of June 30, 2016, credit collateral held from counterparties where Generation had credit exposure included $9 million of cash and $35 million of letters of credit.

aggregate fair value of all derivative instruments with credit-risk-related contingent features in a liability position that are not fully collateralized (excluding transactions on the exchanges that are fully collateralized) is detailed in the table below:
Credit-Risk Related Contingent Feature
June 30, 2016
 
December 31, 2015
Gross Fair Value of Derivative Contracts Containing this Feature(a)
$
(912
)
 
$
(932
)
Offsetting Fair Value of In-the-Money Contracts Under Master Netting Arrangements(b)
657

 
684

       Net Fair Value of Derivative Contracts Containing This Feature(c)
$
(255
)
 
$
(248
)
 _______
(a)
Amount represents the gross fair value of out-of-the-money derivative contracts containing credit-risk related contingent features ignoring the effects of master netting agreements.
(b)
Amount represents the offsetting fair value of in-the-money derivative contracts under legally enforceable master netting agreements with the same counterparty, which reduces the amount of any liability for which a Registrant could potentially be required to post collateral.
(c)
Amount represents the net fair value of out-of-the-money derivative contracts containing credit-risk related contingent features after considering the mitigating effects of offsetting positions under master netting arrangements and reflects the actual net liability upon which any potential contingent collateral obligations would be based.
Ge