Restructuring Charges (Schedule of restructuring charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Charged to Costs and Expenses	$ 6	$ 4	$ 14	$ 6
BakerCorp/BlueLine Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			12
Charged to Costs and Expenses			18
Payments and Other			(13)
Ending Reserve Balance	17		17
BakerCorp/BlueLine Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			3
Charged to Costs and Expenses			13
Payments and Other			(2)
Ending Reserve Balance	14		14
BakerCorp/BlueLine Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			9
Charged to Costs and Expenses			5
Payments and Other			(11)
Ending Reserve Balance	$ 3		$ 3