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Schedule of Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | $ 3,125
Goodwill [Roll Forward] |  |  |
Goodwill | $ 1,073 | $ 1,007 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | (2,118)
Acquisition | 54 | 5 |
Adjustments to the allocation of purchase price | (35) | 61 |
Goodwill | 1,092 | 1,073 |
Americas |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | 2,139
Goodwill [Roll Forward] |  |  |
Goodwill | 552 | 552 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | 1,587
Acquisition | 0 | 0 |
Adjustments to the allocation of purchase price | (13) | 0 |
Goodwill | 539 | 552 |
International |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill |  |  | 986
Goodwill [Roll Forward] |  |  |
Goodwill | 521 | 455 |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | $ 531
Acquisition | 54 | 5 |
Adjustments to the allocation of purchase price | (22) | 61 |
Goodwill | $ 553 | $ 521 |

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