Restructuring And Asset Impairment Charges (Schedule Of Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Restructuring Reserve [Roll Forward]
Beginning reserve balance			$ 28
Charged to costs and expenses (1)	40	2	93	[1]	5
Payments and other			(44)
Ending reserve balance	77		77
Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			27
Charged to costs and expenses (1)			50	[1]
Payments and other			(14)
Ending reserve balance	63		63
Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			1
Charged to costs and expenses (1)			43	[1]
Payments and other			(30)
Ending reserve balance	14		14
Closed Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			28
Charged to costs and expenses (1)			2	[1]
Payments and other			(6)
Ending reserve balance	24		24
Closed Restructuring Program [Member] | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			27
Charged to costs and expenses (1)			2	[1]
Payments and other			(5)
Ending reserve balance	24		24
Closed Restructuring Program [Member] | Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			1
Charged to costs and expenses (1)			0	[1]
Payments and other			(1)
Ending reserve balance	0		0
Current Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			0
Charged to costs and expenses (1)			91	[1]
Payments and other			(38)
Ending reserve balance	53		53
Current Restructuring Program [Member] | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			0
Charged to costs and expenses (1)			48	[1]
Payments and other			(9)
Ending reserve balance	39		39
Current Restructuring Program [Member] | Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			0
Charged to costs and expenses (1)			43	[1]
Payments and other			(29)
Ending reserve balance	$ 14		$ 14

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