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Financing Receivables (Schedule Of Assets Under Lease Receivables) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) MW
Powerton Station Units 5 And 6 [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Asset Location | IL
Lease Receivable, Gross Investment | $ | $ 134
Lease Receivable, % Owned | 64.00%
Lease Receivable, Total, MW | MW | 1,538
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | BB-
Lease Receivable, Counterparty | NRG Energy, Inc.
Joliet Station Units 7 And 8 [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Asset Location | IL
Lease Receivable, Gross Investment | $ | $ 84
Lease Receivable, % Owned | 64.00%
Lease Receivable, Total, MW | MW | 1,044
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | BB-
Lease Receivable, Counterparty | NRG Energy, Inc.
Keystone Station Units 1 And 2 [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | $ | $ 121
Lease Receivable, % Owned | 17.00%
Lease Receivable, Total, MW | MW | 1,711
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | CCC+
Lease Receivable, Counterparty | NRG REMA, LLC
Conemaugh Station Units 1 And 2 [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | $ | $ 121
Lease Receivable, % Owned | 17.00%
Lease Receivable, Total, MW | MW | 1,711
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | CCC+
Lease Receivable, Counterparty | NRG REMA, LLC
Shawville Station Units 1, 2, 3 And 4 [Member] |
Financing Receivable, Recorded Investment [Line Items] |
Lease Receivable, Asset Location | PA
Lease Receivable, Gross Investment | $ | $ 113
Lease Receivable, % Owned | 100.00%
Lease Receivable, Total, MW | MW | 603
Lease Receivable, Asset, Fuel Type | Coal
Lease Receivable, Counterparties' S&P Credit Ratings | CCC+
Lease Receivable, Counterparty | NRG REMA, LLC

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