Financing Receivables (Gross And Net Lease Investment) (Detail) (Energy Holdings [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Energy Holdings [Member]
Lease Receivables (net of Non-Recourse Debt)	$ 663	$ 691
Estimated Residual Value of Leased Assets	525	525
Unearned and Deferred Income	(377)	(380)
Gross Investments in Leases	811	836
Deferred Tax Liabilities	(717)	(738)
Net Investments in Leases	$ 94	$ 98