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Financing Receivables (Schedule Of Assets Under Lease Receivables) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
MW
Powerton Station Units 5 And 6 [Member]
 
Property, Plant and Equipment [Line Items]  
Lease Receivable, Asset Location IL
Lease Receivable, Gross Investment $ 134
Lease Receivable, % Owned 64.00%
Lease Receivable, Total, MW 0
Lease Receivable, Asset, Fuel Type Coal
Lease Receivable, Counterparties' S&P Credit Ratings CCC
Lease Receivable, Counterparty Edison Mission Energy
Joliet Station Units 7 And 8 [Member]
 
Property, Plant and Equipment [Line Items]  
Lease Receivable, Asset Location IL
Lease Receivable, Gross Investment 84
Lease Receivable, % Owned 64.00%
Lease Receivable, Total, MW 0
Lease Receivable, Asset, Fuel Type Coal
Lease Receivable, Counterparties' S&P Credit Ratings CCC
Lease Receivable, Counterparty Edison Mission Energy
Keystone Station Units 1 And 2 [Member]
 
Property, Plant and Equipment [Line Items]  
Lease Receivable, Asset Location PA
Lease Receivable, Gross Investment 114
Lease Receivable, % Owned 17.00%
Lease Receivable, Total, MW 0
Lease Receivable, Asset, Fuel Type Coal
Lease Receivable, Counterparties' S&P Credit Ratings B-  
Lease Receivable, Counterparty GenOn REMA, LLC
Conemaugh Station Units 1 And 2 [Member]
 
Property, Plant and Equipment [Line Items]  
Lease Receivable, Asset Location PA
Lease Receivable, Gross Investment 114
Lease Receivable, % Owned 17.00%
Lease Receivable, Total, MW 0
Lease Receivable, Asset, Fuel Type Coal
Lease Receivable, Counterparties' S&P Credit Ratings B-  
Lease Receivable, Counterparty GenOn REMA, LLC
Shawville Station Units 1, 2, 3 And 4 [Member]
 
Property, Plant and Equipment [Line Items]  
Lease Receivable, Asset Location PA
Lease Receivable, Gross Investment $ 109
Lease Receivable, % Owned 100.00%
Lease Receivable, Total, MW 0
Lease Receivable, Asset, Fuel Type Coal
Lease Receivable, Counterparties' S&P Credit Ratings B-  
Lease Receivable, Counterparty GenOn REMA, LLC