Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 30, 2014
location
Business Acquisition [Line Items]      
Merger related costs $ (27) $ 1  
National Pump      
Business Acquisition [Line Items]      
Number of rental locations     35
Revenue reported by acquired entity for last annual period     210
Revenues 57    
Income before provision for income taxes (2)    
Western Canada | National Pump      
Business Acquisition [Line Items]      
Number of rental locations     4
Other long-term assets | National Pump      
Business Acquisition [Line Items]      
Capitalized debt issuance costs 22    
Merger related costs | National Pump      
Business Acquisition [Line Items]      
Merger related costs $ (27)