Fair Value Measurements (Narrative) (Details) (USD $) In Millions, unless otherwise specified		9 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2014 National Pump	Sep. 30, 2014 Contingent consideration National Pump	Sep. 30, 2014 Merger related costs	Sep. 30, 2014 Merger related costs	Sep. 30, 2014 Diesel swap Fixed price swap contracts gal	Sep. 30, 2014 Level 3 National Pump Accrued expenses and other liabilities	Sep. 30, 2014 First earn-out payment National Pump	Sep. 30, 2014 Second earn-out payment National Pump
Derivatives, Fair Value [Line Items]
Fixed price swap contract (in gallons)					5,300,000
Average contract price (in dollars per gallon)					3.86
Average forward price (in dollars per gallon)					3.65
Contingent consideration	$ 76					$ 81	$ 63	$ 18
Discount rate		11.50%
Change in contingent consideration			$ 3	$ 5