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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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Intangible Assets Goodwill Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Goodwill [Line Items]
Goodwill Impairment	$ 167	$ 167	$ 229
Middle East and North Africa
Goodwill [Line Items]
Goodwill Impairment	127
Russia
Goodwill [Line Items]
Goodwill Impairment	$ 40