Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest in Joint Venture	40.00%		40.00%
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			$ 930	$ 28
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	37	0	440
Pretax income (loss) including direct costs to transact a sale	(1,584)	(1,298)	(1,604)	(1,165)
Tax (benefit) expense - Discontinued Operations	(549)	8	(533)	24
Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	42	149	190	305
Pretax income (loss) including direct costs to transact a sale	286	(3)	314	35
Tax (benefit) expense - Discontinued Operations	(16)	9	(15)	18
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	83	385	369	772
Pretax income (loss) including direct costs to transact a sale	(348)	230	694	426
Tax (benefit) expense - Discontinued Operations	(52)	19	(53)	58
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	7	0	9
Pretax income (loss) including direct costs to transact a sale	2	26	1	32
Tax (benefit) expense - Discontinued Operations	0	0	0	1
MEXICO
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	274		274
Europe and Majority of Latin America [Member]
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	(371)		(371)
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