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Summary of Significant Accounting Standards and Policies - Goodwill and accumulated impairment (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Carrying value of goodwill
Goodwill before impairment charges			$ 956
Accumulated impairment charges			(155)
Balance at the beginning of the period	$ 801	$ 801
Acquisitions		48
Currency translation		(8)
Balance at the end of the period		841
Indefinite-lived intangible assets impairment	0
Goodwill impairment	0
North America
Carrying value of goodwill
Goodwill before impairment charges			608
Accumulated impairment charges			(1)
Balance at the beginning of the period	607	607
Balance at the end of the period		607
South America
Carrying value of goodwill
Goodwill before impairment charges			54
Accumulated impairment charges			(33)
Balance at the beginning of the period	21	21
Currency translation		(6)
Balance at the end of the period		15
Asia-Pacific
Carrying value of goodwill
Goodwill before impairment charges			229
Accumulated impairment charges			(121)
Balance at the beginning of the period	108	108
Acquisitions		48
Currency translation		(3)
Balance at the end of the period		153
EMEA
Carrying value of goodwill
Goodwill before impairment charges			$ 65
Balance at the beginning of the period	$ 65	65
Currency translation		1
Balance at the end of the period		$ 66

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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.

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