Other Income, Net Of Losses (Other Income, Net Of Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Nonoperating Income (Expense) [Abstract]
Fees and Commissions, Mortgage Banking	$ 481	$ 231	$ 234
Fees and Commissions, Other	83	82	92
Remarketing Fees	63	96	126
Other Securitization Income Loss	45	194	20
Unrealized Gain (Loss) on Derivatives	(30)	(137)	(189)
Change in other income due to fair value option elections	(19)	(101)	(217)
Other Nonoperating Income	124	128	268
Other Income	$ 747	$ 493	$ 334