Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	9 Months Ended
	Dec. 31, 1992 Environmental litigation with respect to Lowry Landfill site entity	Sep. 30, 2013 Waste Management litigation
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