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Discontinued and Held-for-sale Operations (Selected Income Statement Information for Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Automotive Finance Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sold Interest in Joint Venture		40.00%
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 400
Pretax income (loss) including direct costs to transact a sale	$ 1	458
Tax (benefit) expense - Discontinued Operations	0	65
Other Segments [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	3	2
Tax (benefit) expense - Discontinued Operations	$ 1	$ (2)

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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