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Goodwill and Other Intangible Assets - Summary (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets |  |  |  |  |
Goodwill | $ 6,247 |  | $ 6,247 | $ 6,215 | $ 5,984
Increase in goodwill during the period |  |  | 32 |  |
Goodwill impairment charges | 34 |  | 34 | 12 |
Intangible assets | 1,052 |  | 1,052 | 1,017 |
Less: Accumulated amortization | (505) |  | (505) | (426) |
Total | 547 |  | 547 | 591 |
Customer and Supplier Relationships [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 880 |  | 880 | 835 |
Less: Accumulated amortization | (422) |  | (422) | (342) |
Total | 458 |  | 458 | 493 |
Covenants Not To Compete [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 48 |  | 48 | 59 |
Less: Accumulated amortization | (21) |  | (21) | (31) |
Total | 27 |  | 27 | 28 |
Licenses Permits and Other [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 124 |  | 124 | 123 |
Less: Accumulated amortization | (62) |  | (62) | (53) |
Total | 62 |  | 62 | 70 |
Energy and Environmental Services [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill impairment charges | 32 |  | $ 34 |  |
Lamp Tracker Reporting Unit [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill impairment charges | $ 2 | $ 10 |  | $ 12 |

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