Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Mar. 21, 2016	Dec. 31, 2015
Other Assets [Abstract]
Property, Plant and Equipment, Gross	$ 838		$ 691
Accumulated depreciation	(507)		(456)
Property, Plant and Equipment, Net	331		235
Restricted cash collections for securitization trusts	1,473		2,010
Deferred Tax Assets, Net	967		1,369
Nonmarketable equity investments	818		418
Other accounts receivable	447		158
Interest Receivable	408		402
Goodwill	240		27
Cash reserve deposits held for securitization trusts	188		252
Derivative Asset, Fair Value, Gross Asset	141		233
Restricted Cash and Cash Equivalents	98		120
Cash and securities collateral placed with counterparties	78		125
Other Assets, Miscellaneous	1,118		972
Other Assets	6,307		6,321
Federal Home Loan Bank Stock	352		391
Federal Reserve Bank Stock	$ 435	$ 435	$ 0