Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Automotive finance operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal			$ 400
Total net (loss) revenue - Discontinued Operations	$ 0	$ 33	0	$ 66
Pretax income (loss) including direct costs to transact a sale	(5)	25	453	55
Tax (benefit) expense - Discontinued Operations	0	5	65	4
Other Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax income (loss) including direct costs to transact a sale	18	22	20	20
Tax (benefit) expense - Discontinued Operations	$ 0	$ 2	$ (2)	$ 2