Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Net Investments in Leases	$ 85	$ (25)
Lease investment with non-investment grade counterparties, gross	335
Lease investment with non-investment grade counterparties, net of deferred taxes	$ (67)
Powerton Station [Member]
Financing Receivable, Recorded Investment [Line Items]
Lease Receivable Percent Owned	64.00%

Lease Investment With Non Investment Grade Counterparties Gross

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- Definition

Lease Investment With Non Investment Grade Counterparties Net Of Deferred Taxes

+ References

No definition available.

+ Details

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- Definition

Lease Receivable, Percent Owned

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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