Other Income, Net Of Losses (Other Income, Net Of Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Nonoperating Income (Expense) [Abstract]
Fees and Commissions, Mortgage Banking	$ 79	$ 122
Fees and Commissions, Other	23	21
Remarketing Fees	20	17
Unrealized Gain (Loss) on Derivatives	0	12
Other Nonoperating Income	35	38
Other Income	$ 157	$ 210