Goodwill - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Goodwill [Line Items]
Number of operating segments \| Segment	3
Goodwill impairment	$ 180
Remaining goodwill allocated to reporting unit	$ 28,465	$ 28,414
Possible increase in risk free interest rate	0.50%
Growth Markets [Member]
Goodwill [Line Items]
Additional impairment due to increase in risk free interest rate	$ 100
Percentage difference between estimated fair value and estimated carrying value	6.00%
Europe [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	10.00%
North America [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	21.00%
Other Segments [Member]
Goodwill [Line Items]
Percentage difference between estimated fair value and estimated carrying value	49.00%
Rimsa [Member]
Goodwill [Line Items]
Goodwill impairment	$ 180
Remaining goodwill allocated to reporting unit	706
Additional impairment due to increase in risk free interest rate	$ 70

Fair Value Assumption Possible Increase in Risk Free Interest Rate

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Goodwill, additional impairment loss.

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Percentage difference between estimated fair value and estimated carrying value.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
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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.

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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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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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