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, 2015	Mar. 31, 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
Pretax income (loss) including direct costs to transact a sale	458	30
Tax (benefit) expense - Discontinued Operations	65	(1)
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	2	(2)
Tax (benefit) expense - Discontinued Operations	$ (2)	$ 0