Financing Receivables (Schedule Of Lease Receivables, Net Of Nonrecourse Debt, Associated With Leveraged Lease Portfolio Based On Counterparty Credit Rating) (Detail) (Energy Holdings [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 724	$ 763
Counterparties' Credit Rating (S&P), AA [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	21	21
Counterparties' Credit Rating (S&P), A+ [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	73	110
Counterparties' Credit Rating (S&P), BBB+ - BBB- [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	316	316
Counterparties' Credit Rating (S&P), B- [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	165	299
Counterparties' Credit Rating (S&P), CCC+ [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	133	0
Counterparties' Credit Rating (S&P) Not Rated [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 16	$ 17