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Summary Of Significant Accounting Policies New Accounting Standards (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Minimum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Expected right-of-use asset and lease liability $ 45
Maximum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Expected right-of-use asset and lease liability $ 55