Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Net Investments in Leases	$ 169	$ 186
Lease investment with non-investment grade counterparties, gross	235
Lease investment with non-investment grade counterparties, net of deferred taxes	$ (22)
Powerton Station [Member]
Financing Receivable, Recorded Investment [Line Items]
Lease Receivable, Counterparties' S&P Credit Ratings	BB
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.

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- Definition

Lease receivable counterparties credit ratings

+ References

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- Definition

Lease Receivable, Percent Owned

+ References

No definition available.

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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.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118948374&loc=SL77920254-209983

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

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