Restructuring and Asset Impairment Charges (Schedule Of restructuring charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Restructuring Reserve [Roll Forward]
Beginning reserve balance			$ 61
Charged to Costs and Expenses	1	40	12	[1]	93
Payments and Other			(32)
Ending reserve balance	41		41
Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			52
Charged to Costs and Expenses			10	[1]
Payments and Other			(24)
Ending reserve balance	38		38
Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			9
Charged to Costs and Expenses			2	[1]
Payments and Other			(8)
Ending reserve balance	3		3
Closed Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			19
Charged to Costs and Expenses			3	[1]
Payments and Other			(8)
Ending reserve balance	14		14
Closed Restructuring Program [Member] | Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			19
Charged to Costs and Expenses			3	[1]
Payments and Other			(8)
Ending reserve balance	14		14
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		0
RSC Merger Related Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			42
Charged to Costs and Expenses			9	[1]
Payments and Other			(24)
Ending reserve balance	27		27
RSC Merger Related Restructuring Program [Member] | Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			33
Charged to Costs and Expenses			7	[1]
Payments and Other			(16)
Ending reserve balance	24		24
RSC Merger Related Restructuring Program [Member] | Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			9
Charged to Costs and Expenses			2	[1]
Payments and Other			(8)
Ending reserve balance	$ 3		$ 3

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