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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment [Line Items] |  |
Net Investments in Leases | $ 186 | $ 85
Lease investment with non-investment grade counterparties, gross | 296 |
Lease investment with non-investment grade counterparties, net of deferred taxes | $ 10 |
Powerton Station [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Lease Receivable Percent Owned | 64.00% |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=77915205&loc=d3e43930-112732 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=77895730&loc=d3e42840-112730 + Details
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