Restructuring And Asset Impairment Charges (Schedule Of Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Restructuring Reserve [Roll Forward]
Beginning reserve balance	$ 61
Charged to Costs and Expenses	6	[1]	0
Payments and Other	(14)
Ending reserve balance	53
Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	52
Charged to Costs and Expenses	4	[1]
Payments and Other	(10)
Ending reserve balance	46
Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	9
Charged to Costs and Expenses	2	[1]
Payments and Other	(4)
Ending reserve balance	7
Closed Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	19
Charged to Costs and Expenses	1	[1]
Payments and Other	(3)
Ending reserve balance	17
Closed Restructuring Program [Member] | Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	19
Charged to Costs and Expenses	1	[1]
Payments and Other	(3)
Ending reserve balance	17
Closed Restructuring Program [Member] | Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	0
Charged to Costs and Expenses	0	[1]
Payments and Other	0
Ending reserve balance	0
Current Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	42
Charged to Costs and Expenses	5	[1]
Payments and Other	(11)
Ending reserve balance	36
Current Restructuring Program [Member] | Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	33
Charged to Costs and Expenses	3	[1]
Payments and Other	(7)
Ending reserve balance	29
Current Restructuring Program [Member] | Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance	9
Charged to Costs and Expenses	2	[1]
Payments and Other	(4)
Ending reserve balance	$ 7

[1] Reflected in our condensed consolidated statements of income as “Restructuring charge.” These charges are not allocated to our reportable segments.