Restructuring Charges (Schedule of restructuring charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Reserve [Roll Forward]
Charged to Costs and Expenses	$ 8	$ 2
BakerCorp/BlueLine Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance	12
Charged to Costs and Expenses	11
Payments and Other	(8)
Ending Reserve Balance	15
BakerCorp/BlueLine Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance	3
Charged to Costs and Expenses	7
Payments and Other	(1)
Ending Reserve Balance	9
BakerCorp/BlueLine Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance	9
Charged to Costs and Expenses	4
Payments and Other	(7)
Ending Reserve Balance	$ 6