Restructuring Charges (Schedule of restructuring charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Restructuring Reserve [Roll Forward]
Beginning reserve balance			$ 35
Charged to Costs and Expenses	1	(5)	0	[1]	(11)
Payments and Other			(9)
Ending reserve balance	26		26
Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			33
Charged to Costs and Expenses			0	[1]
Payments and Other			(8)
Ending reserve balance	25		25
Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			2
Charged to Costs and Expenses			0	[1]
Payments and Other			(1)
Ending reserve balance	1		1
Closed Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning reserve balance			13
Charged to Costs and Expenses			0	[1]
Payments and Other			(2)
Ending reserve balance	11		11
Closed Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			13
Charged to Costs and Expenses			0	[1]
Payments and Other			(2)
Ending reserve balance	11		11
Closed Restructuring Program | Severance costs
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
Restructuring Reserve [Roll Forward]
Beginning reserve balance			22
Charged to Costs and Expenses			0	[1]
Payments and Other			(7)
Ending reserve balance	15		15
RSC Merger Related Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning reserve balance			20
Charged to Costs and Expenses			0	[1]
Payments and Other			(6)
Ending reserve balance	14		14
RSC Merger Related Restructuring Program | Severance costs
Restructuring Reserve [Roll Forward]
Beginning reserve balance			2
Charged to Costs and Expenses			0	[1]
Payments and Other			(1)
Ending reserve balance	$ 1		$ 1

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