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Nuclear Decommissioning (Tables) (Exelon Generation Co L L C [Member])
 9 Months Ended
Sep. 30, 2014
Exelon Generation Co L L C [Member]
  
Schedule Of Nuclear Decommissioning [Line Items]  
Nuclear decommissioning asset retirement obligation rollforward
The following table provides a rollforward of the nuclear decommissioning ARO reflected on Exelon’s and Generation’s Consolidated Balance Sheets from December 31, 2013 to September 30, 2014:
 
Nuclear decommissioning ARO at December 31, 2013(a)
$
4,855

Consolidation of CENG(b)
1,684

Accretion expense
243

Net decrease due to changes in, and timing of, estimated cash flows

(125
)
Costs incurred to decommission retired plants
(5
)
Nuclear decommissioning ARO at September 30, 2014(a)
$
6,652

                         
(a)
Includes $9 million as the current portion of the ARO at September 30, 2014 and December 31, 2013 which is included in Other current liabilities on Exelon’s and Generation’s Consolidated Balance Sheets.
(b)
Includes the fair value of the CENG ARO liability as of April 1, 2014, the date of consolidation. See Note 6 — Investment in Constellation Energy Nuclear Group, LLC for additional information.
Unrealized Gains (Losses) on nuclear decommissioning trust funds
The following table provides unrealized gains (losses) on NDT funds for the three and nine months ended September 30, 2014 and 2013:
 
 
Exelon and Generation
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Net unrealized gains (losses) on decommissioning trust
     funds — Regulatory Agreement Units(a)
$
(107
)
 
$
103

 
$
126

 
$
196

Net unrealized gains (losses) on decommissioning trust
     funds — Non-Regulatory Agreement Units(b)(c)
(41
)
 
46

 
100

 
70

 
                         
(a)
Net unrealized gains (losses) related to Generation’s NDT funds associated with Regulatory Agreement Units are included in Regulatory liabilities on Exelon’s Consolidated Balance Sheets and Noncurrent payables to affiliates on Generation’s Consolidated Balance Sheets.
(b)
Excludes $7 million of net unrealized gains and $9 million of net unrealized losses related to the Zion Station pledged assets for the three months ended September 30, 2014 and 2013, respectively, and $27 million of net unrealized gains and $5 million of net unrealized losses related to the Zion Station pledged assets for the nine months ended September 30, 2014 and 2013, respectively. Net unrealized gains (losses) related to Zion Station pledged assets are included in the Payable for Zion Station decommissioning on Exelon’s and Generation’s Consolidated Balance Sheets.
(c)
Net unrealized gains (losses) related to Generation’s NDT funds with Non-Regulatory Agreement Units are included within Other, net in Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income.
Zion Station pledged assets
The following table provides the pledged assets and payable to ZionSolutions, and withdrawals by ZionSolutions at September 30, 2014 and December 31, 2013:
 
 
Exelon and Generation
 
September 30, 2014
 
December 31, 2013
Carrying value of Zion Station pledged assets
$
365

 
$
458

Payable to Zion Solutions(a)
334

 
414

Current portion of payable to Zion Solutions(b)
74

 
109

Withdrawals by Zion Solutions to pay decommissioning costs(c)
618

 
498

                         
(a)
Excludes a liability recorded within Exelon’s and Generation’s Consolidated Balance Sheets related to the tax obligation on the unrealized activity associated with the Zion Station NDT Funds. The NDT Funds will be utilized to satisfy the tax obligations as gains and losses are realized.
(b)
Included in Other current liabilities within Exelon’s and Generation’s Consolidated Balance Sheets.
(c)
Cumulative withdrawals since September 1, 2010.