Basis of Presentation and Significant Accounting Policies Goodwill (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 0

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

No definition available.

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