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Summary of Significant Accounting Standards and Policies - Goodwill and accumulated impairment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | $ 946
Accumulated impairment charges |  |  | (155)
Balance at the beginning of the period | $ 801 | $ 791 |
Acquisitions | 99 | 7 |
Currency translation | 2 | 3 |
Balance at the end of the period | 902 | 801 |
North America |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 601
Accumulated impairment charges |  |  | (1)
Balance at the beginning of the period | 607 | 600 |
Acquisitions | 14 | 7 |
Balance at the end of the period | 621 | 607 |
South America |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 55
Accumulated impairment charges |  |  | (33)
Balance at the beginning of the period | 21 | 22 |
Currency translation | (4) | (1) |
Balance at the end of the period | 17 | 21 |
Asia-Pacific |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 225
Accumulated impairment charges |  |  | (121)
Balance at the beginning of the period | 108 | 104 |
Acquisitions | 85 |  |
Currency translation | 2 | 4 |
Balance at the end of the period | 195 | 108 |
EMEA |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | $ 65
Balance at the beginning of the period | 65 | 65 |
Currency translation | 4 |  |
Balance at the end of the period | $ 69 | $ 65 |

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