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Goodwill - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) Segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  | 3 |  |
Goodwill impairment |  |  |  |  | $ 300 | $ 6,100 |
Remaining goodwill allocated to reporting unit | $ 27,585 |  |  |  | $ 27,585 |  | $ 28,414
Possible increase in risk free interest rate | 0.50% |  |  |  | 0.50% |  |
Europe [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |  |
Risk of change in fair value due to change in risk free interest rate |  |  |  |  | $ 871 |  |
Risk of impairment loss due to change in risk free interest rate |  |  |  |  | 243 |  |
International Markets [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment | $ 0 |  |  | $ 0 |  |  |
Risk of change in fair value due to change in risk free interest rate |  |  |  |  | 653 |  |
Risk of impairment loss due to change in risk free interest rate |  |  |  |  | $ 605 |  |
North America [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 36.00% |  |  |  | 36.00% |  |
Other Segments [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 43.00% |  |  |  | 43.00% |  |
Rimsa [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment |  |  | $ 180 |  |  |  |
Remaining goodwill allocated to reporting unit |  |  | $ 706 |  |  |  |
Mexico [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill impairment |  | $ 120 |  |  |  |  |
Maximum [Member] | Europe [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 6.00% |  |  |  | 6.00% |  |
Maximum [Member] | International Markets [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 2.00% | 6.00% |  | 6.00% | 2.00% |  |
Minimum [Member] | Europe [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 4.00% |  |  |  | 4.00% |  |
Minimum [Member] | International Markets [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Percentage difference between estimated fair value and estimated carrying value | 1.00% | 2.00% |  | 2.00% | 1.00% |  |

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