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 Goodwill Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 102	$ 229	$ 0	$ 331	$ 0	$ 0
Goodwill, Impaired, Accumulated Impairment Loss	3,000			$ 3,000
Middle East and North Africa
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 43