Goodwill and Other Intangible Assets (Other Intangible Assets Associated with Acquisition) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 895,000,000	$ 875,000,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	8 years	9 years
Net Carrying Amount	$ 884,000,000	$ 866,000,000
Trade names and associated trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	5 years
Net Carrying Amount	$ 5,000,000
BakerCorp
Finite-Lived Intangible Assets [Line Items]
Residual value	$ 0
BakerCorp | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	8 years
Net Carrying Amount	$ 138,000,000
BakerCorp | Trade names and associated trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Amortization Period	5 years
Net Carrying Amount	$ 5,000,000