Restructuring Charges (Schedule of restructuring charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			$ 33
Charged to Costs and Expenses	$ 9	$ 9	15	$ 28
Payments and Other			(22)
Ending Reserve Balance	26		26
Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			21
Charged to Costs and Expenses			2
Payments and Other			(9)
Ending Reserve Balance	14		14
Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			12
Charged to Costs and Expenses			13
Payments and Other			(13)
Ending Reserve Balance	12		12
Closed Restructuring Programs
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			13
Charged to Costs and Expenses			1
Payments and Other			(4)
Ending Reserve Balance	10		10
Closed Restructuring Programs | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			13
Charged to Costs and Expenses			1
Payments and Other			(4)
Ending Reserve Balance	10		10
Closed Restructuring Programs | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			0
Payments and Other			0
Ending Reserve Balance	0		0
NES/Neff/Project XL Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			20
Charged to Costs and Expenses			8
Payments and Other			(16)
Ending Reserve Balance	12		12
NES/Neff/Project XL Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			8
Charged to Costs and Expenses			1
Payments and Other			(5)
Ending Reserve Balance	4		4
NES/Neff/Project XL Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			12
Charged to Costs and Expenses			7
Payments and Other			(11)
Ending Reserve Balance	8		8
BakerCorp Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			6
Payments and Other			(2)
Ending Reserve Balance	4		4
BakerCorp Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			0
Payments and Other			0
Ending Reserve Balance	0		0
BakerCorp Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			0
Charged to Costs and Expenses			6
Payments and Other			(2)
Ending Reserve Balance	$ 4		$ 4