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Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Apr. 30, 2014
National Pump
Locations
Jun. 30, 2014
National Pump
Jun. 30, 2014
National Pump
Apr. 30, 2014
Western Canada
National Pump
Locations
Business Acquisition [Line Items]                
Number of rental locations         35     4
Revenue reported by acquired entity for last annual period         $ 210      
Merger related costs 8 2 9 8   8 9  
Capitalized debt issuance costs         22      
Revenues           67 67  
Income before provision for income taxes           $ 14 $ 14