Description Of Business And Basis of Presentation Other Recently Issued Accounting Standards (Details) - Accounting Standards Update 2016-02 [Member] $ in Millions	Apr. 01, 2019 USD ($)
Minimum [Member]
Description Of Business And Basis of Presentation [Line Items]
Operating Lease, Liability	$ 200
Maximum [Member]
Description Of Business And Basis of Presentation [Line Items]
Operating Lease, Liability	$ 300