Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	6 Months Ended	1 Months Ended
	Dec. 31, 1992 Environmental litigation with respect to Lowry Landfill site entity	Jun. 30, 2014 Waste Management litigation	Nov. 30, 2012 Environmental litigation with respect to Lower Duwamish site item	Nov. 30, 2012 Environmental litigation with respect to Lower Duwamish site Minimum item
Contingencies
Approximate number of other companies named in a lawsuit with respect to Lowry Landfill	38
Response cost related to site, minimum before the company may be asked to make payments		$ 319
Period before projected completion of project when response cost is expected to exceed minimum amount		3 years
Estimated additional cleanup costs		10
Estimated additional site costs for the potentially responsible party (PRP) group		$ 1
Number of potentially responsible parties (PRPs)				50
Number of companies whose data is reviewed upon			30
Number of potentially responsible parties (PRP)whose data is under review				2
Period over which data is reviewed			3 years