Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 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			$ 932	$ 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	0	0	440
Pretax income (loss) including direct costs to transact a sale	(158)	(33)	(1,762)	(1,198)
Tax (benefit) expense - Discontinued Operations	(40)	(17)	(573)	7
Insurance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total net (loss) revenue - Discontinued Operations	0	157	190	462
Pretax income (loss) including direct costs to transact a sale	5	13	319	48
Tax (benefit) expense - Discontinued Operations	3	6	(12)	24
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	119	347	544	1,119
Pretax income (loss) including direct costs to transact a sale	58	185	752	611
Tax (benefit) expense - Discontinued Operations	28	47	(25)	105
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	1	0	10
Pretax income (loss) including direct costs to transact a sale	0	5	1	37
Tax (benefit) expense - Discontinued Operations	0	1	0	2
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
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)
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