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Goodwill and Other Intangible Assets - Summary (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |  |  |  |
Goodwill | $ 6,430 | $ 6,247 | $ 6,430 | $ 6,247 | $ 6,215
Increase in goodwill during the period |  |  | 183 |  |
Goodwill impairment charges |  | 34 | 6 | 34 | $ 12
Intangible assets | 1,118 | 1,052 | 1,118 | 1,052 |
Less: Accumulated amortization | (546) | (505) | (546) | (505) |
Total | 572 | 547 | 572 | 547 |
Customer and Supplier Relationships [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 949 | 880 | 949 | 880 |
Less: Accumulated amortization | (461) | (422) | (461) | (422) |
Total | 488 | 458 | 488 | 458 |
Non-compete Covenant [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 60 | 48 | 60 | 48 |
Less: Accumulated amortization | (24) | (21) | (24) | (21) |
Total | 36 | 27 | 36 | 27 |
Licenses Permits and Other [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Intangible assets | 109 | 124 | 109 | 124 |
Less: Accumulated amortization | (61) | (62) | (61) | (62) |
Total | 48 | $ 62 | $ 48 | $ 62 |
Lamp Tracker Reporting Unit [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Goodwill impairment charges | $ 6 |  |  |  |

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