Restructuring and Asset Impairment Charges (Schedule Of Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended		12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2012 Branch closure charges [Member]	Dec. 31, 2011 Branch closure charges [Member]	Dec. 31, 2012 Closed Restructuring Program [Member]		Dec. 31, 2011 Closed Restructuring Program [Member]		Dec. 31, 2010 Closed Restructuring Program [Member]		Dec. 31, 2012 Closed Restructuring Program [Member] Branch closure charges [Member]		Dec. 31, 2011 Closed Restructuring Program [Member] Branch closure charges [Member]		Dec. 31, 2010 Closed Restructuring Program [Member] Branch closure charges [Member]		Dec. 31, 2012 Closed Restructuring Program [Member] Severance costs [Member]		Dec. 31, 2011 Closed Restructuring Program [Member] Severance costs [Member]		Dec. 31, 2010 Closed Restructuring Program [Member] Severance costs [Member]		Dec. 31, 2012 Current Restructuring Program [Member]		Dec. 31, 2012 Current Restructuring Program [Member] Branch closure charges [Member]		Dec. 31, 2012 Current Restructuring Program [Member] Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance	$ 28	[1]						$ 28		$ 28		$ 21		$ 27		$ 26		$ 20		$ 1		$ 2		$ 1		$ 0		$ 0		$ 0
Charged to Costs and Expenses (1)	99		19		34	6	14	3	[2]	19	[2]	34	[2]	3	[2]	17	[2]	28	[2]	0	[2]	2	[2]	6	[2]	96	[2]	53	[2]	43	[2]
Payments and Other								(12)		(19)		(27)		(11)		(16)		(22)		(1)		(3)		(5)		(54)		(20)		(34)
Ending Reserve Balance	$ 61	[1]	$ 28	[1]				$ 19		$ 28		$ 28		$ 19		$ 27		$ 26		$ 0		$ 1		$ 2		$ 42		$ 33		$ 9

[1] Relates to branch closure charges and severance costs. See note 5 (“Restructuring and Asset Impairment Charges”) for additional detail.

[2] Reflected in our consolidated statements of income as “Restructuring charge.” The restructuring charges are not allocated to our segments.