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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Goodwill [Line Items] |  |
Beginning balance | $ 20,624 | [1]
Goodwill reclassified as assets to held for sale | (13) |
Translation differences | (432) |
Ending balance | 20,179 | [1]
North America [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 6,473 | [1]
Translation differences | 0 |
Ending balance | 6,473 | [1]
Europe [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 9,102 | [1]
Goodwill reclassified as assets to held for sale | (7) |
Translation differences | (388) |
Ending balance | 8,707 | [1]
International Markets [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 2,362 | [1]
Translation differences | (44) |
Ending balance | 2,318 | [1]
Other [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 2,687 | [1]
Goodwill reclassified as assets to held for sale | (6) |
Ending balance | $ 2,681 | [1]
[1] | Accumulated goodwill impairment as of September 30, 2021 and December 31, 2020 was approximately $25.6 billion.

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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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 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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- Details
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