Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 1,300,000,000		$ 1,300,000,000
Financing Receivable, Modifications, Number of Contracts	5,583	5,838
Financing Receivable, Modifications, Pre-Modification Recorded Investment	204,000,000	317,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	187,000,000	269,000,000
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	5,359	5,285
Financing Receivable, Modifications, Pre-Modification Recorded Investment	84,000,000	79,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	71,000,000	68,000,000
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	218	545
Financing Receivable, Modifications, Pre-Modification Recorded Investment	49,000,000	169,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	45,000,000	134,000,000
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	6	8
Financing Receivable, Modifications, Pre-Modification Recorded Investment	71,000,000	69,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	71,000,000	67,000,000
Commercial And Industrial Automobile [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	4
Financing Receivable, Modifications, Pre-Modification Recorded Investment	23,000,000	25,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	23,000,000	25,000,000
Commercial And Industrial Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	3	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	48,000,000	33,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	48,000,000	31,000,000
Commercial Real Estate Automobile [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	3
Financing Receivable, Modifications, Pre-Modification Recorded Investment	0	11,000,000
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 11,000,000