Restructuring Charges (Schedule of Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Charged to Costs and Expenses	$ 16	$ 18	$ 31	$ 50
Restructuring charges incurred to date		333
BakerCorp/BlueLine Restructuring Program
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		12	0
Charged to Costs and Expenses		22	22
Payments and Other		(25)	(10)
Ending Reserve Balance	12	9	12	0
Restructuring charges incurred to date		44
BakerCorp/BlueLine Restructuring Program | Branch closure charges
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		3	0
Charged to Costs and Expenses		16	4
Payments and Other		(11)	(1)
Ending Reserve Balance	3	8	3	0
Restructuring charges incurred to date		20
BakerCorp/BlueLine Restructuring Program | Severance and other
Restructuring Reserve [Roll Forward]
Beginning Reserve Balance		9	0
Charged to Costs and Expenses		6	18
Payments and Other		(14)	(9)
Ending Reserve Balance	$ 9	1	$ 9	$ 0
Restructuring charges incurred to date		$ 24