Financing Receivables (Gross And Net Lease Investment) (Detail) - Energy Holdings [Member] - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Financial Receivables [Line Items]
Lease Receivables (net of Non-Recourse Debt)	$ 274	$ 299
Estimated Residual Value of Leased Assets	55	55
Total Investment in Rental Receivables	329	354
Unearned and Deferred Income	(96)	(104)
Gross Investments in Leases	233	250
Deferred Tax Liabilities	(57)	(64)
Net Investments in Leases	$ 176	$ 186

Leveraged Leases Gross Investment

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- Definition

Schedule of Financial Receivables [Line Items]

+ References

No definition available.

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- Definition

The estimated portion of pretax income and investment tax credit remaining to be allocated to income over the lease term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 30
-Paragraph 14
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121556109&loc=d3e42840-112730

Reference 2: 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=121579104&loc=SL77920254-209983

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- Definition

Taxes arising from arrangements meeting the criteria for classification as leveraged leases due to timing differences between accounting and tax income recognition.

+ References

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- Definition

The net investment in arrangements meeting the criteria for classification as leveraged leases including deferred taxes.

+ References

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- Definition

The gross rentals receivable equal to the future cash flows from the lessee.

+ 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=121579104&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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121556109&loc=d3e42840-112730

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 25
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=121561328&loc=d3e42229-112728

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- Definition

This element represents leveraged lease rentals receivable, net of that portion of the rental applicable to principal and interest on the nonrecourse debt.

+ References

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- Definition

The estimate of the value of the leased asset at the end of the lease term.

+ References

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