Restructuring Charges (Schedule of restructuring charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Charged to Costs and Expenses	$ 2	$ 9	$ 16	$ 15
BakerCorp/BlueLine Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			12
Charged to Costs and Expenses			20
Payments and Other			(18)
Ending Reserve Balance	14		14
BakerCorp/BlueLine Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			3
Charged to Costs and Expenses			14
Payments and Other			(5)
Ending Reserve Balance	12		12
BakerCorp/BlueLine Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance			9
Charged to Costs and Expenses			6
Payments and Other			(13)
Ending Reserve Balance	$ 2		$ 2