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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of the derivative fair value
The following tables provide a summary of the derivative fair value balances recorded by Exelon, Generation, and ComEd as of September 30, 2021 and December 31, 2020:
ExelonGenerationComEd
September 30, 2021Total
Derivatives
Economic
Hedges
Proprietary
Trading
Collateral(a)(b)
Netting(a)
SubtotalEconomic
Hedges
Mark-to-market derivative assets
(current assets)
$1,505 $19,631 $63 $(790)$(17,399)$1,505 $— 
Mark-to-market derivative assets
(noncurrent assets)
661 3,612 (201)(2,755)661 — 
Total mark-to-market derivative assets2,166 23,243 68 (991)(20,154)2,166 — 
Mark-to-market derivative liabilities
(current liabilities)
(1,710)(18,490)(55)(559)17,399 (1,705)(5)
Mark-to-market derivative liabilities
(noncurrent liabilities)
(720)(3,168)(3)(95)2,755 (511)(209)
Total mark-to-market derivative liabilities(2,430)(21,658)(58)(654)20,154 (2,216)(214)
Total mark-to-market derivative net (liabilities) assets$(264)$1,585 $10 $(1,645)$— $(50)$(214)
ExelonGenerationComEd
December 31, 2020Total
Derivatives
Economic
Hedges
Proprietary
Trading
Collateral(a)(b)
Netting(a)
SubtotalEconomic
Hedges
Mark-to-market derivative assets
(current assets)
$639 $2,757 $40 $103 $(2,261)$639 $— 
Mark-to-market derivative assets
(noncurrent assets)
554 1,501 64 (1,015)554 — 
Total mark-to-market derivative assets1,193 4,258 44 167 (3,276)1,193 — 
Mark-to-market derivative liabilities
(current liabilities)
(293)(2,629)(23)131 2,261 (260)(33)
Mark-to-market derivative liabilities
(noncurrent liabilities)
(472)(1,335)(2)118 1,015 (204)(268)
Total mark-to-market derivative liabilities(765)(3,964)(25)249 3,276 (464)(301)
Total mark-to-market derivative net assets (liabilities)$428 $294 $19 $416 $— $729 $(301)
_________
(a)Exelon and Generation net all available amounts allowed under the derivative authoritative guidance in 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. As of September 30, 2021, $1 million of cash collateral posted with external counterparties and an additional $71 million of cash collateral posted with affiliates, including $50 million with ComEd, and as of December 31, 2020, $15 million of cash collateral held with external counterparties, was not offset against derivative positions because such collateral was not associated with any energy-related derivatives, was associated with accrual positions, or had no positions to offset as of the balance sheet date.
(b)Includes $2,084 million held and $209 million posted of variation margin with the exchanges as of September 30, 2021 and December 31, 2020 respectively.
Economic Hedges (Commodity Price Risk) For the three and nine months ended September 30, 2021 and 2020, Exelon and Generation recognized the following net pre-tax commodity mark-to-market gains (losses) which are also located in the Net fair value changes related to derivatives line in the Consolidated Statements of Cash Flows.
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Income Statement Location(Loss) Gain(Loss) Gain
Operating revenues$(637)$39 $(961)$238 
Purchased power and fuel1,392 209 2,209 224 
Total Exelon and Generation$755 $248 $1,248 $462 
Disclosure of Credit Derivatives [Table Text Block]
The following tables provide information on Generation’s credit exposure for all derivative instruments, NPNS, and payables and receivables, net of collateral and instruments that are subject to master netting agreements, as of September 30, 2021. 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 amounts 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. 
Rating as of September 30, 2021Total Exposure Before Credit Collateral
Credit Collateral(a)
Net ExposureNumber of Counterparties Greater than 10% of Net ExposureNet Exposure of Counterparties Greater than 10% of Net Exposure
Investment grade$701 $254 $447 — $— 
Non-investment grade23 21 — — 
No external ratings
Internally rated — investment grade110 109 — — 
Internally rated — non-investment grade309 48 261 — — 
Total$1,143 $305 $838 — $— 
 
Net Credit Exposure by Type of CounterpartyAs of September 30, 2021
Financial institutions$53 
Investor-owned utilities, marketers, power producers652 
Energy cooperatives and municipalities62 
Other71 
Total$838 
_________ 
(a)As of September 30, 2021, credit collateral held from counterparties where Generation had credit exposure included $188 million of cash and $117 million of letters of credit. The credit collateral does not include non-liquid collateral.
Fair Value of Derivatives with Credit- Risk Related Contingent Features [Table Text Block]
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 FeaturesSeptember 30, 2021December 31, 2020
Gross fair value of derivative contracts containing this feature(a)
$(5,289)$(834)
Offsetting fair value of in-the-money contracts under master netting arrangements(b)
2,735 537 
Net fair value of derivative contracts containing this feature(c)
$(2,554)$(297)
_________
(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 Generation 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.
Cash Collateral and Letters of Credit on Derivative Contracts [Table Text Block]
As of September 30, 2021 and December 31, 2020, Exelon and Generation posted or held the following amounts of cash collateral and letters of credit on derivative contracts with external counterparties, after giving consideration to offsetting derivative and non-derivative positions under master netting agreements.
September 30, 2021December 31, 2020
Cash collateral posted$299 $511 
Letters of credit posted477 226 
Cash collateral held1,872 110 
Letters of credit held130 40 
Additional collateral required in the event of a credit downgrade below investment grade3,001 1,432