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Acquisitions and Divestitures (Detail) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 08, 2016 USD ($) | Mar. 26, 2015 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business acquired | item |  |  |  |  |  |  |  |  |  |  | 24 | 30 | 27
Consideration, net of cash acquired, for business acquisitions |  |  |  |  |  |  |  |  |  |  | $ 205 | $ 604 | $ 646
Business acquisitions closed during the year, cash payments |  |  |  |  |  |  |  |  |  |  | 183 | 581 | 537
Other consideration |  |  |  |  |  |  |  |  |  |  | 22 | 23 |
Contingent consideration paid for acquisitions closed in previous year |  |  |  |  |  |  |  |  |  |  | 3 | 4 | 4
Purchase price holdbacks paid |  |  | $ 14 |  |  |  | $ 26 |  |  |  | 14 | 26 | 13
Purchase price holdbacks paid for acquisitions closed in current year |  |  | 13 |  |  |  | 16 |  |  |  | 13 | 16 |
Allocation of consideration to property and equipment |  |  | 127 |  |  |  | 115 |  |  |  | 127 | 115 | 243
Allocation of consideration to other intangible assets |  |  | 46 |  |  |  | 212 |  |  |  | 46 | 212 | 145
Allocation of consideration to goodwill |  |  | 39 |  |  |  | 280 |  |  |  | 39 | 280 | 325
Contingent consideration outstanding |  |  | 7 |  |  |  | 37 |  |  |  | 7 | 37 |
Estimated fair value of contingent liability |  |  |  |  |  |  |  |  |  |  |  |  | 96
Operating revenues |  |  | 3,652 | $ 3,716 | $ 3,677 | $ 3,440 | 3,460 | $ 3,548 | $ 3,425 | $ 3,176 | 14,485 | 13,609 | 12,961
Tax deductible, goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 166
Non tax deductible, goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 159
Purchase price holdbacks |  |  |  |  |  |  |  |  |  |  |  |  | 13
Aggregate sales prices for divestitures of operations |  |  |  |  |  |  |  |  |  |  | 62 | 2 | 79
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  | 38 | (9) | 7
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of contingent liability |  |  |  |  |  |  |  |  |  |  |  |  | 126
Customer and Supplier Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets |  |  | 39 |  |  |  | 185 |  |  |  | 39 | 185 | 131
Covenants not-to-compete [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets |  |  | 7 |  |  |  | 23 |  |  |  | 7 | 23 | 8
Trade Name [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets |  |  |  |  |  |  | 4 |  |  |  |  | 4 | $ 6
Southern Waste Systems [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration, net of cash acquired, for business acquisitions | $ 525 |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to property and equipment | 93 |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets | 182 |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to goodwill | 250 |  |  |  |  |  |  |  |  |  |  |  |
Southern Waste Systems [Member] | Covenants not-to-compete [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets | 18 |  |  |  |  |  |  |  |  |  |  |  |
Southern Waste Systems [Member] | Trade Name [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets | $ 4 |  |  |  |  |  |  |  |  |  |  |  |
Deffenbaugh Disposal, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration, net of cash acquired, for business acquisitions |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to property and equipment |  | 207 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets |  | 100 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to goodwill |  | 159 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other assets |  | 50 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to cash acquired |  | 15 |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to liabilities |  | 101 |  |  |  |  |  |  |  |  |  |  |
Deffenbaugh Disposal, Inc. [Member] | Trade Name [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of consideration to other intangible assets |  | $ 6 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility, aggregate capacity |  |  | $ 2,250 |  |  |  | $ 2,250 |  |  |  | $ 2,250 | $ 2,250 |

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