Financing Receivables (Schedule Of Lease Receivables, Net Of Nonrecourse Debt, Associated With Leveraged Lease Portfolio Based On Counterparty Credit Rating) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 1,216	$ 1,230
Energy Holdings [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	691
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), AA [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	18
Energy Holdings [Member] | Standard & Poor's, AA- Rating [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	56
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), BBB - BB [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	317
Energy Holdings [Member] | Standard & Poor's, BB- Rating [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	134
Energy Holdings [Member] | Standard & Poor's, B Rating [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	164
Energy Holdings [Member] | Counterparties' Credit Rating (S&P) Not Rated [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 2