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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Schedule of Financial Receivables [Line Items] |  |  |  |
Pre-Tax Lease write-down | $ 58 |  |  |
Lease investment with non-investment grade counterparties, gross |  | $ 235 |  |
Lease investment with non-investment grade counterparties, net of deferred taxes |  | (25) |  |
Assets to be classified as Held-for-sale |  | $ 29 |  | $ 30
Powerton Station [Member] |  |  |  |
Schedule of Financial Receivables [Line Items] |  |  |  |
Counterparties’ S&P Credit Ratings |  | BB |  |
Subsequent Event [Member] |  |  |  |
Schedule of Financial Receivables [Line Items] |  |  |  |
Assets to be classified as Held-for-sale |  |  | $ 160 |

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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