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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

X

- 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

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+ References

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