Finance Receivables And Loans, Net (Financing Receivable Credit Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 100,778	$ 100,328	$ 96,993
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	100,777	100,327
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	58,114	56,417
Consumer Loans Auto Financing Receivable [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	57,787	56,088
Consumer Loans Auto Financing Receivable [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	327	329
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	7,847	8,444
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election	7,846	8,443
Residential Mortgage [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	7,660	8,251
Residential Mortgage [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance receivables and loans, net	$ 186	$ 192