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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |  |
Beginning balance | [1] | $ 24,917 | $ 28,414 |  |
Goodwill impairment |  |  | (3,027) | [2] | $ (17,100)
Goodwill disposal |  | (28) | (79) | [3] |
Goodwill reclassified as assets to held for sale |  |  | (20) |  |
Translation differences and other |  | (43) | (371) |  |
Ending balance | [1] | 24,846 | 24,917 |  | 28,414
North America [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance | [1] | 11,098 | 11,144 |  |
Goodwill disposal |  | (23) |  |  |
Translation differences and other |  | 16 | (46) |  |
Ending balance | [1] | 11,091 | 11,098 |  | 11,144
Europe [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance | [1] | 8,653 | 9,001 |  |
Goodwill disposal |  | (5) | (65) | [3] |
Goodwill reclassified as assets to held for sale |  |  | (3) |  |
Translation differences and other |  | (112) | (280) |  |
Ending balance | [1] | 8,536 | 8,653 |  | 9,001
International Markets [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance | [1] | 2,479 | 5,404 |  |
Goodwill impairment | [2] |  | (2,834) |  |
Goodwill disposal | [3] |  | (14) |  |
Translation differences and other |  | 53 | (77) |  |
Ending balance | [1] | 2,532 | 2,479 |  | 5,404
Other [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Beginning balance | [1] | 2,687 | 2,865 |  |
Goodwill impairment | [2] |  | (193) |  |
Goodwill reclassified as assets to held for sale |  |  | (17) |  |
Translation differences and other |  |  | 32 |  |
Ending balance | [1] | $ 2,687 | $ 2,687 |  | $ 2,865
[1] | Accumulated goodwill impairment as of December 31, 2019, December 31, 2018 and January 1, 2018 was approximately $21.0 billion, $21.0 billion and $18.0 billion, respectively.
[2] | Goodwill impairment mainly attributable to the International Markets segment, Mexico and Medis.
[3] | Mainly due to the divestment of the women’s health business, the sale of Actavis Brazil and other activities.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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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 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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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. + References No definition available. + Details
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- Definition Amount of divestiture of an asset representing 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 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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