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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |
Impairment Amount Of Goodwill Based On Market Assessment | $ 120 |  | $ 300 |
Maximum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Percentage of headroom |  |  |  | 6.00%
International Markets [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 4.00% |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 2.30% |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.74% |  |
International Markets [Member] | Maximum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.40% |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 0.30% |  |
Europe [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 22.00% |  |
North America [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Impairment Amount Of Goodwill Based On Market Assessment |  | $ 5,000 |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 9.00% |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 2.00% |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.00% |  |
North America [Member] | Maximum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.90% |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 0.60% |  |
Medis [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 45.00% |  |
TAPI [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 15.00% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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