Acquisitions and Divestitures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended							12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Oakleaf [Member]	Dec. 31, 2011 Oakleaf [Member]	Dec. 31, 2010 Oakleaf [Member]	Jul. 28, 2011 Oakleaf [Member]	Dec. 31, 2012 Solid Waste [Member] Business	Dec. 31, 2012 Customer Contracts and Customer Relationships [Member]	Dec. 31, 2011 Customer Contracts and Customer Relationships [Member]	Dec. 31, 2010 Customer Contracts and Customer Relationships [Member]	Dec. 31, 2012 Covenants Not-to-Compete [Member]	Dec. 31, 2011 Covenants Not-to-Compete [Member]	Dec. 31, 2010 Covenants Not-to-Compete [Member]	Dec. 31, 2011 Licenses Permits and Other [Member]	Dec. 31, 2010 Licenses Permits and Other [Member]
Business Acquisition [Line Items]
Payment for interests in oil and gas producing properties									$ 94
Number of business acquired																32
Total consideration, net of cash acquired for business acquisitions closed during the year	244				893				244	893	427
Business acquisitions closed during the year, cash payments	207				839				207	839	379
Deposits paid during prior year for acquisitions completed in current year									7
Estimated fair value of liability for additional cash payments related to acquisitions	22				47				22	47	23
Business acquisition, assumed liabilities	8				7				8	7	5
Obligation for contingent cash payments, maximum	57				49				57	49	23
Contingent consideration paid for acquisitions closed in current year									9	12	8
Contingent consideration paid for acquisitions closed in previous year	34				8				34	8	20
Allocation of purchase price to property and equipment	126				225				126	225	279
Allocation of purchase price to other intangible assets	43				225				43	225	98						34	166	35	9	29	8	30	55
Purchase price allocation to goodwill	69				497				69	497	77	328	327
Amount paid in deposits for acquisitions										8
Acquisition cost of acquired entity															432
Cash received in acquisition															4
Total operating revenues	3,434	3,461	3,459	3,295	3,406	3,522	3,347	3,103	13,649	13,378	12,515			580
Acquisition related costs classified as Selling, general and administrative expenses													1
Revenues recognized by acquiree												617	265
Net income recognized by acquiree													Less than $1 million
Net losses recognized by acquiree												29
Business acquisitions closed during the year, contributed assets											20
Aggregate sale price for divestures of operations									7	32	1
Recognized net gains on divestures of operations									Less than $1 million
Recognized net gain (loss) on divestures of operations										$ (1)	$ 1