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Schedule of Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | $ 3,091
Goodwill [Roll Forward] |  |  |
Goodwill | $ 1,007 | $ 973 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | (2,118)
Acquisition | 5 | 25 |
Adjustments to the allocation of purchase price | 61 | 9 |
Goodwill | 1,073 | 1,007 |
Americas |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | 2,124
Goodwill [Roll Forward] |  |  |
Goodwill | 552 | 537 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | 1,587
Acquisition | 0 | 2 |
Adjustments to the allocation of purchase price | 0 | 13 |
Goodwill | 552 | 552 |
International |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | 967
Goodwill [Roll Forward] |  |  |
Goodwill | 455 | 436 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | $ 531
Acquisition | 5 | 23 |
Adjustments to the allocation of purchase price | 61 | (4) |
Goodwill | $ 521 | $ 455 |

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