Income Taxes And Tax-Related Items (Principal Components of Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for loan losses	$ 220	$ 255
Deferred compensation	134	142
Deferred benefit plan	113	147
Loan purchase accounting adjustments	38	73
Deferred loan origination fees and costs	30	29
Foreign tax credit	1	14
Other tax credits	39	54
Other temporary differences, net	34	52
Total deferred tax assets	609	766
Deferred tax liabilities:
Lease financing transactions	241	262
Net unrealized gains on investment securities available-for-sale	(86)	(73)
Allowance for depreciation	28	36
Total deferred tax liabilities	(355)	(371)
Net deferred tax asset	$ 254	$ 395