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Summary of Significant Accounting Standards and Policies - Goodwill impairment (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Carrying value of goodwill and accumulated impairment charges |  |  |
Goodwill before impairment charges | $ 946 | $ 958 |
Accumulated impairment charges | (155) | (155) |
Goodwill net of accumulated impairment charges | 791 | 803 | $ 784
North America |  |  |
Carrying value of goodwill and accumulated impairment charges |  |  |
Goodwill before impairment charges | 601 | 601 |
Accumulated impairment charges | (1) | (1) |
Goodwill net of accumulated impairment charges | 600 | 600 | 610
South America |  |  |
Carrying value of goodwill and accumulated impairment charges |  |  |
Goodwill before impairment charges | 55 | 59 |
Accumulated impairment charges | (33) | (33) |
Goodwill net of accumulated impairment charges | 22 | 26 | 26
Asia Pacific |  |  |
Carrying value of goodwill and accumulated impairment charges |  |  |
Goodwill before impairment charges | 225 | 228 |
Accumulated impairment charges | (121) | (121) |
Goodwill net of accumulated impairment charges | 104 | 107 | 85
EMEA |  |  |
Carrying value of goodwill and accumulated impairment charges |  |  |
Goodwill before impairment charges | 65 | 70 |
Goodwill net of accumulated impairment charges | $ 65 | $ 70 | $ 63

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