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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2017
Schedule of Financial Receivables [Line Items] |  |  |  |  |
Lease Receivable adjustment | $ 15 | $ 55 | $ 10 |  |
Residual Value Adjustment | $ 7 |  |  | $ 137 |
Lease investment with non-investment grade counterparties, gross |  |  |  |  | $ 337
Lease investment with non-investment grade counterparties, net of deferred taxes |  |  |  |  | $ (184)
Powerton Station [Member] |  |  |  |  |
Schedule of Financial Receivables [Line Items] |  |  |  |  |
Counterparties’ S&P Credit Ratings |  |  |  |  | BB-

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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