Securitizations And Variable Interest Entities (Schedule Of Cash Flow Received and Paid To Nonconsolidated Securitization Entities) (Details) - Consumer Portfolio Segment [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Automobile Loan [Member]
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	$ (3)	$ (3)
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers		1,044	$ 1,557
Cash Flows Between Transferor and Transferee, Servicing Fees		21	6
Representations and warranties obligations			0
Residential Mortgage [Member]
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers		0	0
Cash Flows Between Transferor and Transferee, Servicing Fees		$ 0	0
Representations and warranties obligations			$ (9)