Financing Receivables (Schedule Of Lease Receivables, Net Of Nonrecourse Debt, Associated With Leveraged Lease Portfolio Based On Counterparty Credit Rating) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 631	$ 691
Energy Holdings [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	631
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), AA [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	17
Energy Holdings [Member] | Counterparties' Credit Rating (S&P), BBB plus - BBB minus [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	316
Energy Holdings [Member] | Standard & Poor's, BB minus Rating [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	134
Energy Holdings [Member] | Standard & Poor's, CCC plus Rating [Member]
Guarantor Obligations [Line Items]
Lease Receivables, Net of Non-Recourse Debt	$ 164