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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  | $ 3,027 | [1] | $ 17,100
International Markets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | [1] |  | $ 2,834 |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 16.00% |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 2.03% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 9.80% |  |  |
International Markets [Member] | Maximum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 1.53% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.30% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 11.00% |  |  |
International Markets [Member] | Minimum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.50% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 0.50% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 9.00% |  |  |
Europe [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 12.00% |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 1.36% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 9.52% |  |  |
Europe [Member] | Maximum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.86% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.02% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 8.00% |  |  |
Europe [Member] | Minimum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.50% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 0.50% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 6.00% |  |  |
North America [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 26.00% |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 1.61% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.22% |  |  |
North America [Member] | Maximum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | $ 1,230 |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 1.11% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 10.72% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 21.00% |  |  |
North America [Member] | Minimum [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Terminal Value Percentage Increase Or Decrease Threshold |  | 0.50% |  |  |
Increase Or Decrease In The Discount Rate In Percentage Terms Threshold Limits |  | 0.50% |  |  |
Percentage difference between fair value and carrying value in respect of goodwill |  | 18.00% |  |  |
Medis [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 72.00% |  |  |
TAPI [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 23.00% |  |  |
[1] | Goodwill impairment mainly attributable to the International Markets segment, Mexico and Medis.

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