Employee Benefits (Multiemployer Plans) (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) plan	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Multiemployer Plans [Line Items]
Number of multiemployer plans \| plan	2
Foreign Plan [Member]
Multiemployer Plans [Line Items]
Contributions to multi-employer plans \| $	$ 7	$ 8	$ 5

Amount of contributions made to multiemployer plan by all employers who participate in plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 7
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947

Name:	us-gaap_MultiemployerPlansPlanContributions1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration