Financing Receivables (Gross And Net Lease Investment) (Detail) - Energy Holdings [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Schedule of Financial Receivables [Line Items]
Lease Receivables (net of Non-Recourse Debt)	$ 502	$ 504
Estimated Residual Value of Leased Assets	326	326
Total Investment in Rental Receivables	828	830
Unearned and Deferred Income	(285)	(290)
Gross Investments in Leases	543	540
Deferred Tax Liabilities	(356)	(354)
Net Investments in Leases	$ 187	$ 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

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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

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

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-SubTopic 30
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77907235&loc=d3e45152-112736

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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
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-Publisher FASB
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-SubTopic 30
-Section 30
-Paragraph 14
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- Definition

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

+ 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
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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

+ Details

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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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