Restructuring And Asset Impairment Charges (Schedule Of restructuring charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Restructuring Reserve [Roll Forward]
Beginning reserve balance			$ 61
Charged to Costs and Expenses	5	53	11	[1]	53
Payments and Other			(24)
Ending reserve balance	48		48
Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			52
Charged to Costs and Expenses			9	[1]
Payments and Other			(18)
Ending reserve balance	43		43
Severance costs [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			9
Charged to Costs and Expenses			2	[1]
Payments and Other			(6)
Ending reserve balance	5		5
Closed Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			19
Charged to Costs and Expenses			2	[1]
Payments and Other			(6)
Ending reserve balance	15		15
Closed Restructuring Program [Member] | Branch closure charges [Member]
Restructuring Reserve [Roll Forward]
Beginning reserve balance			19
Charged to Costs and Expenses			2	[1]
Payments and Other			(6)
Ending reserve balance	15		15
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			(18)
Ending reserve balance	33		33
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			(12)
Ending reserve balance	28		28
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			(6)
Ending reserve balance	$ 5		$ 5

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