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Restructuring and Acquisition Related Expenses - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs		$ 2
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	$ 3	2
Stahlgruber [Member]
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs		1
Andrew Page
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	2	$ 2
Maximum
Acquisition And Restructuring Integration Plans [Abstract]
Expected future restructuring expenses	$ (20)

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- Definition

Acquisition And Restructuring Integration Plans [Abstract]

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- Definition

Acquisition Related Expenses [Abstract]

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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- Definition

Amount of expected cost remaining for the specified restructuring cost.

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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