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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items] |  |
Net Investments in Leases | $ 186 | $ 169
Shawville Station [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Lease Receivable, Counterparties' S&P Credit Ratings | BB+ |
Merrill Creek Reservoir [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Net Investments in Leases | $ 20 |
Lease Receivable, Counterparty | Metropolitan Edison Company (a subsidiary of First Energy) |
Lease Receivable, Gross Investment | $ 26 |

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- Definition The net investment in arrangements meeting the criteria for classification as leveraged leases including deferred taxes. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121579104&loc=SL77920254-209983 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121556109&loc=d3e42840-112730 + Details
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