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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Energy Holdings [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Investment in Leveraged Leases, Net | $ 169 | $ 186
Shawville Station [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Investment in Leveraged Leases, Net | 18 |
Lease Receivable Gross Investment | $ 23 |

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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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