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Financing Receivables (Schedule Of Lease Receivables, Net Of Nonrecourse Debt, Associated With Leveraged Lease Portfolio Based On Counterparty Credit Rating) (Detail) - Energy Holdings [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Financial Receivables [Line Items] |  |
Lease Receivables (net of Non-Recourse Debt) | $ 274 | $ 299
Standard & Poor's, AA Rating [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Lease Receivables (net of Non-Recourse Debt) | 8 |
Standard & Poor's, A- Rating [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Lease Receivables (net of Non-Recourse Debt) | 51 |
Standard & Poor's, BBB plus - BBB - Rating [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Lease Receivables (net of Non-Recourse Debt) | 178 |
Standard & Poor's, BB Rating [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Lease Receivables (net of Non-Recourse Debt) | $ 37 |

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- Definition Schedule of Financial Receivables [Line Items] + References No definition available. + Details
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- Definition This element represents leveraged lease rentals receivable, net of that portion of the rental applicable to principal and interest on the nonrecourse debt. + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556109&loc=d3e42840-112730 + Details
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