Financing Receivables (Gross And Net Lease Investment) (Detail) - Energy Holdings [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Schedule of Financial Receivables [Line Items]
Lease Receivables (net of Non-Recourse Debt)	$ 631	$ 691
Estimated Residual Value of Leased Assets	519	525
Unearned and Deferred Income	(368)	(380)
Gross Investment in Leases	782	836
Deferred Tax Liabilities	(706)	(738)
Net Investment in Leases	$ 76	$ 98