Finance Receivables And Loans, Net (Past Due Financing Receivables And Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 1,119	$ 1,001
60 - 89 days past due	276	256
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	310	337
Total past due	1,705	1,594
Current	93,576	97,461
Finance receivables and loans, net	95,281	99,055	121,259
Consumer Loans Auto Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,024	920
60 - 89 days past due	231	213
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	153	138
Total past due	1,408	1,271
Current	55,042	52,444
Finance receivables and loans, net	56,450	53,715
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	81	81
60 - 89 days past due	27	43
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	135	174
Total past due	243	298
Current	8,529	9,523
Finance receivables and loans, net	8,772	9,821
First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	64	66
60 - 89 days past due	22	37
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	123	156
Total past due	209	259
Current	6,134	6,914
Finance receivables and loans, net	6,343	7,173
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	17	15
60 - 89 days past due	5	6
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	12	18
Total past due	34	39
Current	2,395	2,609
Finance receivables and loans, net	2,429	2,648
Commercial Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	14	0
60 - 89 days past due	18	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	22	25
Total past due	54	25
Current	30,005	35,494
Finance receivables and loans, net	30,059	35,519
Commercial And Industrial Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	14	0
60 - 89 days past due	11	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	15	16
Total past due	40	16
Current	25,651	30,254
Finance receivables and loans, net	25,691	30,270
Commercial And Industrial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total past due	0	0
Current	0	0
Finance receivables and loans, net	0	0
Commercial And Industrial Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	1
Total past due	0	1
Current	1,607	2,696
Finance receivables and loans, net	1,607	2,697
Commercial Real Estate Automobile [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	7	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	7	8
Total past due	14	8
Current	2,747	2,544
Finance receivables and loans, net	2,761	2,552
Commercial Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	0
60 - 89 days past due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Total past due	0	0
Current	0	0
Finance receivables and loans, net	$ 0	$ 0