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Derivative Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]  
Summary of the derivative fair value
The following table provides a summary of the derivative fair value balances recorded by the Registrants as of September 30, 2018:
 
 
Generation
 
ComEd
 
DPL
 
Exelon
Derivatives
 
Economic
Hedges
 
Proprietary
Trading
 
Collateral
and
Netting(a)(e)
 
Subtotal(b)
 
Economic
Hedges(c)
 
Economic
Hedges(d)
 
Collateral
and
Netting(a)
 
Subtotal
 
Total
Derivatives
Mark-to-market derivative assets (current assets)
 
$
2,987

 
$
113

 
$
(2,406
)
 
$
694

 
$
—

 
$
—

 
$
—

 
$
—

 
$
694

Mark-to-market derivative assets (noncurrent assets)
 
1,383

 
61

 
(1,013
)
 
431

 
—

 
—

 
—

 
—

 
431

Total mark-to-market derivative assets
 
4,370

 
174

 
(3,419
)
 
1,125

 
—

 
—

 
—

 
—

 
1,125

Mark-to-market derivative liabilities (current liabilities)
 
(2,761
)
 
(86
)
 
2,543

 
(304
)
 
(24
)
 
—

 
—

 
—

 
(328
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
(1,284
)
 
(41
)
 
1,088

 
(237
)
 
(235
)
 
—

 
—

 
—

 
(472
)
Total mark-to-market derivative liabilities
 
(4,045
)
 
(127
)
 
3,631

 
(541
)
 
(259
)
 
—

 
—

 
—

 
(800
)
Total mark-to-market derivative net assets (liabilities)
 
$
325

 
$
47

 
$
212

 
$
584

 
$
(259
)
 
$
—

 
$
—

 
$
—

 
$
325

_________
(a)
Exelon, Generation and DPL net all available amounts allowed under the derivative authoritative 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 $71 million and $28 million, respectively, and current and noncurrent liabilities are shown net of collateral of $66 million and $47 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $212 million at September 30, 2018.
(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.
(e)
Of the collateral posted/(received), $(166) million represents variation margin on the exchanges.
The following table provides a summary of the derivative fair value balances recorded by the Registrants as of December 31, 2017:
 
 
Generation
 
ComEd
 
DPL
 
Exelon
Description
 
Economic
Hedges
 
Proprietary
Trading
 
Collateral
and
Netting(a)(e)
 
Subtotal(b)
 
Economic
Hedges(c)
 
Economic
Hedges(d)
 
Collateral and
Netting(a)
 
Subtotal
 
Total
Derivatives
Mark-to-market derivative assets (current assets)
 
$
3,061

 
$
56

 
$
(2,144
)
 
$
973

 
$
—

 
$
—

 
$
—

 
$
—

 
$
973

Mark-to-market derivative assets (noncurrent assets)
 
1,164

 
12

 
(845
)
 
331

 
—

 
—

 
—

 
—

 
331

Total mark-to-market derivative assets
 
4,225

 
68

 
(2,989
)
 
1,304

 
—

 
—

 
—

 
—

 
1,304

Mark-to-market derivative liabilities (current liabilities)
 
(2,646
)
 
(43
)
 
2,480

 
(209
)
 
(21
)
 
(1
)
 
1

 
—

 
(230
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
(1,137
)
 
(10
)
 
975

 
(172
)
 
(235
)
 
—

 
—

 
—

 
(407
)
Total mark-to-market derivative liabilities
 
(3,783
)
 
(53
)
 
3,455

 
(381
)
 
(256
)
 
(1
)
 
1

 
—

 
(637
)
Total mark-to-market derivative net assets (liabilities)
 
$
442

 
$
15

 
$
466

 
$
923

 
$
(256
)
 
$
(1
)
 
$
1

 
$
—

 
$
667

_________ 
(a)
Exelon, Generation and DPL net all available amounts allowed under the derivative authoritative 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 $169 million and $53 million, respectively, and current and noncurrent liabilities are shown net of collateral of $167 million and $77 million, respectively. The total cash collateral posted, net of cash collateral received and offset against mark-to-market assets and liabilities was $466 million at December 31, 2017.
(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.
(e)
Of the collateral posted/(received), $(117) million represents variation margin on the exchanges.
Below is a summary of the interest rate and foreign exchange hedge balances as of September 30, 2018:
 
 
Generation
 
Exelon Corporate
 
Exelon
Description
 
Economic
Hedges
 
Collateral
and
Netting(a)
 
Subtotal
 
Economic Hedges
 
Total
Mark-to-market derivative assets (current assets)
 
$
3

 
$
(1
)
 
$
2

 
$
—

 
$
2

Mark-to-market derivative assets (noncurrent assets)
 
18

 
—

 
18

 
—

 
18

Total mark-to-market derivative assets
 
21

 
(1
)
 
20

 
—

 
20

Mark-to-market derivative liabilities (current liabilities)
 
(2
)
 
1

 
(1
)
 
—

 
(1
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
—

 
—

 
—

 
(10
)
 
(10
)
Total mark-to-market derivative liabilities
 
(2
)
 
1

 
(1
)
 
(10
)
 
(11
)
Total mark-to-market derivative net assets (liabilities)
 
$
19

 
$
—

 
$
19

 
$
(10
)
 
$
9

__________
(a)
Exelon and Generation net all available amounts allowed under the derivative authoritative 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 counterparty 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, which 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, 2017:
 
 
Generation
 
Exelon Corporate
 
Exelon
Description
 
Derivatives
Designated
as Hedging
Instruments
 
Economic
Hedges
 
Collateral
and
Netting(a)
 
Subtotal
 
Derivatives
Designated
as Hedging
Instruments
 
Total
Mark-to-market derivative assets (current assets)
 
$
—

 
$
10

 
$
(7
)
 
$
3

 
$
—

 
$
3

Mark-to-market derivative assets (noncurrent assets)
 
3

 
—

 
—

 
3

 
3

 
6

Total mark-to-market derivative assets
 
3

 
10

 
(7
)
 
6

 
3

 
9

Mark-to-market derivative liabilities (current liabilities)
 
(2
)
 
(7
)
 
7

 
(2
)
 
—

 
(2
)
Mark-to-market derivative liabilities (noncurrent liabilities)
 
—

 
(2
)
 
—

 
(2
)
 
—

 
(2
)
Total mark-to-market derivative liabilities
 
(2
)
 
(9
)
 
7

 
(4
)
 
—

 
(4
)
Total mark-to-market derivative net assets
 
$
1

 
$
1

 
$
—

 
$
2

 
$
3

 
$
5

__________
(a)
Exelon and Generation net all available amounts allowed under the derivative authoritative 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 counterparty 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, which are not reflected in the table above.
Derivative Instruments, Gain (Loss) [Table Text Block]
For the three and nine months ended September 30, 2018 and 2017, Exelon and Generation recognized the following net pre-tax commodity mark-to-market gains (losses) which are also located in the "Net fair value changes related to derivatives" on the Consolidated Statements of Cash Flows.
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Income Statement Location
 
Gain (Loss)
Operating revenues
 
$
8

 
$
55

 
$
(99
)
 
$
(41
)
Purchased power and fuel
 
66

 
21

 
(4
)
 
(114
)
Total Exelon and Generation
 
$
74

 
$
76

 
$
(103
)
 
$
(155
)
Exelon and Generation include the gain or loss on the hedged items and the offsetting loss or gain on the related interest rate swaps as follows:
 
 
 
Three Months Ended September 30,
 
Income Statement
Location
 
2018
 
2017
 
2018
 
2017
 
 
Loss on Swaps
 
Gain on Borrowings
Exelon
Interest expense
 
$
—

 
$
(2
)
 
$
—

 
$
6

 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
Income Statement
Location
 
2018
 
2017
 
2018
 
2017
 
 
Loss on Swaps
 
Gain on Borrowings
Exelon
Interest expense
 
$
(11
)
 
$
(6
)
 
$
20

 
$
17

For the three and nine months ended September 30, 2018 and 2017, Exelon and Generation recognized the following net pre-tax mark-to-market gains (losses) in the Consolidated Statements of Operations and Comprehensive Income and are included in “Net fair value changes related to derivatives” in Exelon’s and Generation’s Consolidated Statements of Cash Flows.
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
 
2018
 
2017
 
2018
 
2017
 
Income Statement Location
 
Gain (Loss)
Generation
Operating Revenues
 
$
(2
)
 
$
(3
)
 
$
3

 
$
(6
)
Generation
Purchased Power and Fuel
 
(1
)
 
—

 
(4
)
 
—

Generation
Interest Expense
 
4

 
—

 
4

 
—

Total Generation
 
 
$
1

 
$
(3
)
 
$
3

 
$
(6
)
 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
 
2018
 
2017
 
2018
 
2017
 
Income Statement Location
 
Gain (Loss)
Exelon
Operating Revenues
 
$
(2
)
 
$
(3
)
 
$
3

 
$
(6
)
Exelon
Purchased Power and Fuel
 
(1
)
 
—

 
(4
)
 
—

Exelon
Interest Expense
 
2

 
—

 
2

 
—

Total Exelon
 
 
$
(1
)
 
$
(3
)
 
$
1

 
$
(6
)
The tables below provide the activity of OCI related to cash flow hedges for the three and nine months ended September 30, 2018 and 2017, containing information about the changes in the fair value of cash flow hedges and the reclassification from AOCI into results of operations. The amounts reclassified from OCI, 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 September 30, 2018
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
AOCI derivative loss at June 30, 2018
 
 
 
$
(4
)
 
$
(2
)
 
Reclassifications from AOCI to net income
 
Interest Expense
 
—

 
—

 
AOCI derivative loss at September 30, 2018
 
 
 
$
(4
)
 
$
(2
)
 
 
 
 
 
 
 
 
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax
Generation
 
Exelon
 
Nine Months Ended September 30, 2018
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
AOCI derivative loss at December 31, 2017
 
 
 
$
(16
)
 
$
(14
)
 
Effective portion of changes in fair value
 
 
 
11

 
11

 
Reclassifications from AOCI to net income
 
Interest Expense
 
1

 
1

 
AOCI derivative loss at September 30, 2018
 
 
 
$
(4
)
 
$
(2
)
 
 
 
 
 
 
 
 
 
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax
 
Generation
 
Exelon
 
Three Months Ended September 30, 2017
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash 
Flow Hedges
 
AOCI derivative loss at June 30, 2017
 
 
 
$
(14
)
 
$
(12
)
 
Effective portion of changes in fair value
 
 
 
1

 
1

 
Reclassifications from AOCI to net income
 
Interest Expense
 
(1
)
(a) 
(1
)
(a) 
AOCI derivative loss at September 30, 2017
 
 
 
$
(14
)
 
$
(12
)
 
 
 
 
 
 
 
 
 
 
 
Total Cash Flow Hedge OCI Activity, Net of Income Tax
 
Generation
 
Exelon
 
Nine Months Ended September 30, 2017
 
Income Statement
Location
 
Total Cash 
Flow Hedges
 
Total Cash
Flow Hedges
 
AOCI derivative loss at December 31, 2016
 
 
 
$
(19
)
 
$
(17
)
 
Effective portion of changes in fair value
 
 
 
2

 
2

 
Reclassifications from AOCI to net income
 
Interest Expense
 
3

(b) 
3

(b) 
AOCI derivative loss at September 30, 2017
 
 
 
$
(14
)
 
$
(12
)
 
_________
(a)
Amount is net of related income tax benefit of $1 million for the three months ended September 30, 2017.
(b)
Amount is net of related income tax expense of $2 million for the nine months ended September 30, 2017.
Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]
For the three and nine months ended September 30, 2018 and 2017 Exelon and Generation recognized the following net pre-tax commodity mark-to-market gains (losses) which are also included in the "Net fair value changes related to derivatives" on the Consolidated Statements of Cash Flows. The Utility Registrants do not execute derivatives for proprietary trading purposes.
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2018
 
2017
 
2018
 
2017
Income Statement Location
 
Gain (Loss)
Operating revenues
 
$
(3
)
 
$
5

 
$
14

 
$
4

For the nine months ended September 30, 2017, Exelon and Generation recognized a $1 million net pre-tax commodity mark-to-market loss.
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
The 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 September 30, 2018. 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, NASDAQ, NGX and Nodal commodity exchanges. Additionally, the figures in the tables below exclude exposures with affiliates, including net receivables with ComEd, PECO, BGE, Pepco, DPL and ACE of $47 million, $26 million, $23 million, $39 million, $8 million, and $6 million as of September 30, 2018, respectively. 
Rating as of September 30, 2018
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
$
647

 
$
—

 
$
647

 
1

 
$
176

Non-investment grade
101

 
20

 
81

 


 


No external ratings
 
 
 
 
 
 
 
 
 
Internally rated — investment grade
179

 
1

 
178

 


 


Internally rated — non-investment grade
139

 
17

 
122

 


 


Total
$
1,066

 
$
38

 
$
1,028

 
1

 
$
176

 
Net Credit Exposure by Type of Counterparty
 
As of
September 30, 2018
Financial institutions
 
$
19

Investor-owned utilities, marketers, power producers
 
572

Energy cooperatives and municipalities
 
357

Other
 
80

Total
 
$
1,028

_________ 
(a)
As of September 30, 2018, credit collateral held from counterparties where Generation had credit exposure included $4 million of cash and $34 million of letters of credit. The credit collateral does not include non-liquid collateral.
The 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 Features
 
September 30, 2018
 
December 31, 2017
Gross fair value of derivative contracts containing this feature(a)
 
$
(1,704
)
 
$
(926
)
Offsetting fair value of in-the-money contracts under master netting arrangements(b)
 
1,249

 
577

Net fair value of derivative contracts containing this feature(c)
 
$
(455
)
 
$
(349
)
_________
(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.
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
The following table provides notional amounts outstanding held by Exelon and Generation at September 30, 2018 related to interest rate swaps and foreign currency exchange rate swaps.
 
 
Generation
 
Exelon Corporate
 
Exelon
Foreign currency exchange rate swaps
 
$
88

 
$
—

 
$
88

Interest rate swaps
 
625

 
800

 
1,425

Total
 
$
713

 
$
800

 
$
1,513


The following table provides notional amounts outstanding held by Exelon and Generation at December 31, 2017 related to interest rate swaps and foreign currency exchange rate swaps.
 
 
Generation
 
Exelon Corporate
 
Exelon
Foreign currency exchange rate swaps
 
$
94

 
$
—

 
$
94

Interest rate swaps(a)
 
1

 
—

 
1

Total
 
$
95

 
$
—

 
$
95

__________
(a)
On July 1, 2018, Exelon and Generation de-designated its fair value and cash flow hedges. The table excludes amounts of $800 million of fixed-to-floating hedges that were previously designated as fair value hedges by Exelon and $636 million of floating-to-fixed hedges that were previously designated as cash flow hedges by Exelon and Generation as of December 31, 2017.