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Acquisitions and Divestitures - Intangibles (Detail) - USD ($) $ in Millions | Jan. 08, 2016 | Mar. 26, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  |  | $ 46 | $ 212 | $ 145
Covenants not-to-compete [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  |  | $ 7 | 23 | 8
Trade Name [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  |  |  | $ 4 | $ 6
Deffenbaugh Disposal, Inc. [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  | $ 100 |  |  |
Total other intangible assets subject to amortization, Periods |  | 15 years |  |  |
Deffenbaugh Disposal, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  | $ 94 |  |  |
Total other intangible assets subject to amortization, Periods |  | 15 years |  |  |
Deffenbaugh Disposal, Inc. [Member] | Trade Name [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Total other intangible assets subject to amortization, Amount |  | $ 6 |  |  |
Total other intangible assets subject to amortization, Periods |  | 15 years |  |  |
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 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 |  |  |  |

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- 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 + Details
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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 + Details
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