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Financing Receivables (Schedule Of Assets Under Lease Receivables) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) MW
Powerton Station Units 5 And 6 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Lease Receivable, Asset Location | IL |
Lease Receivable, Gross Investment | $ | $ 132 |
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 | $ | $ 85 |
Lease Receivable, % Owned | 64.00% |
Lease Receivable, Total, MW | MW | 1,036 |
Lease Receivable, Asset, Fuel Type | Gas |
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 | $ | $ 20 |
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 | REMA (A) | [1]
Conemaugh Station Units 1 And 2 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Lease Receivable, Asset Location | PA |
Lease Receivable, Gross Investment | $ | $ 20 |
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 | REMA (A) | [1]
Shawville Station Units 1, 2, 3 And 4 [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Lease Receivable, Asset Location | PA |
Lease Receivable, Gross Investment | $ | $ 78 |
Lease Receivable, % Owned | 100.00% |
Lease Receivable, Total, MW | MW | 596 |
Lease Receivable, Asset, Fuel Type | Gas |
Lease Receivable, Counterparties' S&P Credit Ratings | CCC- |
Lease Receivable, Counterparty | REMA (A) | [1]
[1] | GenOn Energy Inc. (GenOn), and certain of its subsidiaries (which did not include REMA) filed voluntary petitions for relief under Chapter 11 of the U.S. Bankruptcy Code. GenOn is currently engaged in a balance sheet restructuring, which will take an undetermined time to complete. Certain subsidiaries of Energy Holdings, REMA, consenting holders of the pass-through certificates and other parties entered into a Forbearance relating to the Conemaugh facility. For additional information, see Note 7. Long-Term Investments.

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