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Acquisitions and Divestitures - Intangibles (Detail) - USD ($) $ in Millions	Jan. 08, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible assets
Total other intangible assets subject to amortization, Amount		$ 141	$ 46	$ 212
Customer and Supplier Relationships [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount		124	39	185
Covenants not-to-compete [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount		$ 16	$ 7	23
Trade Name [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount				$ 4
Southern Waste Systems [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount	$ 182
Total other intangible assets subject to amortization, Periods	9 years 6 months
Southern Waste Systems [Member] | Customer and Supplier Relationships [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount	$ 160
Total other intangible assets subject to amortization, Periods	10 years
Southern Waste Systems [Member] | Covenants not-to-compete [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount	$ 18
Total other intangible assets subject to amortization, Periods	5 years
Southern Waste Systems [Member] | Trade Name [Member]
Intangible assets
Total other intangible assets subject to amortization, Amount	$ 4
Total other intangible assets subject to amortization, Periods	10 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

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+ References

No definition available.

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