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v3.19.3.a.u2

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

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration