Finance Receivables And Loans, Net Finance Receivables And Loans, Net (Redefaults) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	180	100	399	103
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	$ 6	$ 6	$ 12	$ 6
Redefault Charge-off	2	1	4	1
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	161	88	369	88
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	1	1	3	1
Redefault Charge-off	1	1	2	1
First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	7	4	12	5
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	2	2	3	2
Redefault Charge-off	1	0	1	0
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	9	7	13	9
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	0	0	1	0
Redefault Charge-off	0	0	1	0
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	16	11	25	14
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	2	2	4	2
Redefault Charge-off	1	0	2	0
Commercial And Industrial Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	2	1	4	1
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	1	3	3	3
Redefault Charge-off	0	0	0	0
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	1	0	1	0
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	2	0	2	0
Redefault Charge-off	0	0	0	0
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Number of loans redefaulted within 12 months of being modified [Line Item]	3	1	5	1
Financing Receivable, Redefaults, Carrying Value Before Allowance [Line Item]	3	3	5	3
Redefault Charge-off	$ 0	$ 0	$ 0	$ 0