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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  | $ 11,000 | $ 6,100 | $ 3,027 | $ 17,100 | $ 900 |
Goodwill | $ 24,917 |  |  | 28,414 |  | 24,917 | 28,414 | $ 44,409 |
MEXICO |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment |  | $ 120 |  |  |  |  |  |  |
International Markets [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | 2,530 | $ 0 |  |  |  | 2,834 |  |  |
Goodwill | 2,479 |  |  | 5,404 |  | 2,479 | 5,404 |  |
International Markets [Member] | Reduction in the terminal value growth rate of 0.1% [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | 48 |  |  |  |  |  |  |  |
International Markets [Member] | Increase in discount rate of 0.1% [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | 68 |  |  |  |  |  |  |  |
International Markets [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 6.00% |  |  |  |  |  |  | 2.00%
International Markets [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  | 2.00% |  |  |  |  |  |  | 1.00%
Europe [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | 8,653 |  |  | 9,001 |  | 8,653 | 9,001 |  |
Decrease in estimated difference between fair value and carrying value, percent |  |  |  |  |  |  |  |  | 6.00%
Europe [Member] | Reduction in the terminal value growth rate of 0.1% [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | 121 |  |  |  |  |  |  |  |
Europe [Member] | Increase in discount rate of 0.1% [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | 171 |  |  |  |  |  |  |  |
Europe [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  |  |  |  |  |  |  |  | 6.00%
Europe [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent |  |  |  |  |  |  |  |  | 4.00%
North America [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | $ 11,098 |  |  | $ 11,144 |  | $ 11,098 | $ 11,144 |  |
Decrease in estimated difference between fair value and carrying value, percent | 28.00% |  |  |  |  | 28.00% |  |  |
Rimsa [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  | $ 180 |  |  |  |  |  |
Goodwill |  |  | $ 706 |  |  |  |  |  |
Medis [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment | $ 170 |  |  |  |  |  |  |  |
Goodwill | $ 300 |  |  |  |  | $ 300 |  |  |
TAPI [Member] | North America [Member] |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Decrease in estimated difference between fair value and carrying value, percent | 47.00% |  |  |  |  | 47.00% |  |  |

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