Restructuring And Asset Impairment Charges (Schedule Of Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011
Restructuring Reserve [Roll Forward]
Beginning reserve balance			$ 28
Charged to costs and expenses (1)	53	2	53	[1]	3
Payments and other			(18)
Ending reserve balance	63		63
Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			27
Charged to costs and expenses (1)			19	[1]
Payments and other			(3)
Ending reserve balance	43		43
Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			1
Charged to costs and expenses (1)			34	[1]
Payments and other			(15)
Ending reserve balance	20		20
Closed Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			28
Charged to costs and expenses (1)			1	[1]
Payments and other			(3)
Ending reserve balance	26		26
Closed Restructuring Program [Member] | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			27
Charged to costs and expenses (1)			1	[1]
Payments and other			(2)
Ending reserve balance	26		26
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)			52	[1]
Payments and other			(15)
Ending reserve balance	37		37
Current Restructuring Program [Member] | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			0
Charged to costs and expenses (1)			18	[1]
Payments and other			(1)
Ending reserve balance	17		17
Current Restructuring Program [Member] | Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			0
Charged to costs and expenses (1)			34	[1]
Payments and other			(14)
Ending reserve balance	$ 20		$ 20

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