Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest in Joint Venture	40.00%
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$ 888	$ 0
Mortgage Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	0	403
Pretax income (loss) including direct costs to transact a sale	(20)	133
Tax (benefit) expense - Discontinued Operations	16	16
Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	148	156
Pretax income (loss) including direct costs to transact a sale	28	38
Tax (benefit) expense - Discontinued Operations	1	9
Automotive finance operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	286	387
Pretax income (loss) including direct costs to transact a sale	1,042	196
Tax (benefit) expense - Discontinued Operations	(1)	39
Commercial Finance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	0	2
Pretax income (loss) including direct costs to transact a sale	(1)	6
Tax (benefit) expense - Discontinued Operations	0	1
CANADA
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$ 888