Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	$ 2,513	$ 2,590	$ 2,462
Translation effects		(77)	128
Acquisition (divestiture) related adjustments	16
Impairment	(595)
Balance of Goodwill at end of the period	1,934	2,513	2,590
Europe
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	874	913	808
Translation effects	(15)	(39)	105
Balance of Goodwill at end of the period	859	874	913
Americas
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	1,634	1,672	1,649
Translation effects	15	(38)	23
Acquisition (divestiture) related adjustments	21
Impairment	(595)
Balance of Goodwill at end of the period	1,075	1,634	1,672
Accumulated impairment losses	595
North America
Changes in the carrying amount of goodwill
Balance of Goodwill at end of the period	446
Other
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	5	5	5
Acquisition (divestiture) related adjustments	(5)
Balance of Goodwill at end of the period		5	5
Asia Pacific
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period	0	0
Balance of Goodwill at end of the period	0	0	0
Accumulated impairment losses	$ 1,135	$ 1,135	$ 1,135

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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Amount of accumulated impairment loss for 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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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments 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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