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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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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period					$ 1,934	$ 2,513	$ 2,590
Translation effects					17		(77)
Acquisition (divestiture) related adjustments						16
Impairment	$ 0	$ 0	$ 0			(595)
Balance of Goodwill at end of the period	1,951		1,934		1,951	1,934	2,513
Europe
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period					859	874	913
Translation effects					74	(15)	(39)
Balance of Goodwill at end of the period	933		859		933	859	874
Americas
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period					1,075	1,634	1,672
Translation effects					(57)	15	(38)
Acquisition (divestiture) related adjustments						21
Impairment				$ (595)		(595)
Balance of Goodwill at end of the period	$ 1,018		$ 1,075		$ 1,018	1,075	1,634
Other
Changes in the carrying amount of goodwill
Balance of Goodwill at beginning of period						5	5
Acquisition (divestiture) related adjustments						$ (5)
Balance of Goodwill at end of the period							$ 5