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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Changes in the Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 were as follows:
|  | North America |  |  | Europe |  |  | International Markets |  |  | Other |  |  | Total |
|  | (U.S. $ in millions) |
Balance as of December 31, 201 8 (1) |  | $ | 11,098 |  |  | $ | 8,653 |  |  | $ | 2,479 |  |  | $ | 2,687 |  |  | $ | 24,917 |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwil l disposal |  |  | (23 | ) |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | (28 | )
Translation differences |  |  | 16 |  |  |  | (112 | ) |  |  | 53 |  |  |  | — |  |  |  | (43 | )
Balance as of December 31, 2019 (1) |  | $ | 11,091 |  |  | $ | 8,536 |  |  | $ | 2,532 |  |  | $ | 2,687 |  |  | $ | 24,846 |
Changes during the period: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill reclassified as assets held for sale |  |  | — |  |  |  | (8 | ) |  |  | (19 | ) |  |  | — |  |  |  | (27 | )
Goodwill impairment |  |  | (4,628 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,628 | )
Translation differences |  |  | 10 |  |  |  | 574 |  |  |  | (151 | ) |  |  | — |  |  |  | 433 |
Balance as of December 31 , 2020 (1) |  | $ | 6,473 |  |  | $ | 9,102 |  |  | $ | 2,362 |  |  | $ | 2,687 |  |  | $ | 20,624 |
(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 Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration