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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%

X

- Definition

Fair Value Percentage Decrease In Goodwill Impairment

+ References

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Percentage Increase or Decrease In The Discount Rate

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Percentage Increase or Decrease In The Terminal Value Of Growth Rate

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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.

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- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

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