Acquisitions and Divestitures - Divestitures (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Oct. 30, 2020
Divestitures
Gain (Loss) on Disposition of Assets	$ 8
Advanced Disposal [Member] \| Disposed of by Sale, Not Discontinued Operations [Member]
Divestitures
Divestiture consideration		$ 856

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration