Basis of Presentation - Additional Information (Detail) $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($) Areas	Jun. 30, 2016 USD ($)
Basis Of Presentation [Line Items]
Increase to net cash provided by operating activities	$ 1,534	$ 1,494
Increase to net cash used in financing activities	$ 857	309
Solid Waste [Member]
Basis Of Presentation [Line Items]
Number of areas \| Areas	17
Accounting Standards Update 2016-09 [Member] \| Excess Tax Benefits Or Deficiencies [Member]
Basis Of Presentation [Line Items]
Increase to net cash provided by operating activities		17
Increase to net cash used in financing activities		17
Accounting Standards Update 2016-09 [Member] \| Tax Payments Associated with Equity Based Compensation Transactions [Member]
Basis Of Presentation [Line Items]
Increase to net cash provided by operating activities		23
Increase to net cash used in financing activities		$ 23

Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration