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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) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | $ 629 | $ 631
Energy Holdings [Member] |  |
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | 629 |
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), AA [Member] |  |
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | 16 |
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), BBB plus - BBB minus [Member] |  |
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | 316 |
Energy Holdings [Member] | Standard & Poor's, BB minus Rating [Member] |  |
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | 133 |
Energy Holdings [Member] | Standard & Poor's, CCC+ Rating [Member] |  |
Guarantor Obligations [Line Items] |  |
Lease Receivables, Net of Non-Recourse Debt | $ 164 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7662307&loc=d3e42840-112730 + Details
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