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Summary of Significant Accounting Standards and Policies - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | $ 958
Accumulated impairment charges |  |  | (155)
Balance at the beginning of the period | $ 791 | $ 803 |
Acquisitions | 7 |  |
Currency translation | 3 | 12 |
Balance at the end of the period | 801 | 791 |
North America |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 601
Accumulated impairment charges |  |  | (1)
Balance at the beginning of the period | 600 | 600 |
Acquisitions | 7 |  |
Balance at the end of the period | 607 | 600 |
South America |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 59
Accumulated impairment charges |  |  | (33)
Balance at the beginning of the period | 22 | 26 |
Currency translation | (1) | 4 |
Balance at the end of the period | 21 | 22 |
Asia-Pacific |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | 228
Accumulated impairment charges |  |  | (121)
Balance at the beginning of the period | 104 | 107 |
Currency translation | 4 | 3 |
Balance at the end of the period | 108 | 104 |
EMEA |  |  |
Carrying value of goodwill |  |  |
Goodwill before impairment charges |  |  | $ 70
Balance at the beginning of the period | 65 | 70 |
Currency translation |  | 5 |
Balance at the end of the period | $ 65 | $ 65 |

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