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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |  |
Beginning balance | [1] | $ 24,846 | $ 24,917 |
Goodwill reclassified as assets to held for sale |  | (27) |  |
Goodwill disposal |  |  | (28) |
Goodwill impairment |  | (4,628) |  | $ (3,027)
Translation differences |  | 433 | (43) |
Ending balance | [1] | 20,624 | 24,846 | 24,917
North America [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance | [1] | 11,091 | 11,098 |
Goodwill disposal |  |  | (23) |
Goodwill impairment |  | (4,628) |  |
Translation differences |  | 10 | 16 |
Ending balance | [1] | 6,473 | 11,091 | 11,098
Europe [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance | [1] | 8,536 | 8,653 |
Goodwill reclassified as assets to held for sale |  | (8) |  |
Goodwill disposal |  |  | (5) |
Translation differences |  | 574 | (112) |
Ending balance | [1] | 9,102 | 8,536 | 8,653
International Markets [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance | [1] | 2,532 | 2,479 |
Goodwill reclassified as assets to held for sale |  | (19) |  |
Translation differences |  | (151) | 53 |
Ending balance | [1] | 2,362 | 2,532 | 2,479
Other [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance | [1] | 2,687 | 2,687 |
Ending balance | [1] | $ 2,687 | $ 2,687 | $ 2,687
[1] | Accumulated goodwill impairment as of December 31, 2020, December 31, 2019 and December 31, 2018 was approximately $25.6 billion, $21.0 billion and $21.0 billion, respectively.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=120320667&loc=SL49117168-202975 Reference 3: 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=121556970&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=121556970&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=121586364&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=121556970&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 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=121556970&loc=d3e13816-109267 + Details
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