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Significant Accounting Policies (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 17,000,000   $ 0
Operating lease liabilities $ 23,000,000    
Minimum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Recognition requirements lease term 12 months    
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 0  
Operating lease right-of-use assets   24,000,000  
Operating lease liabilities   $ 24,000,000  
Accounting Standards Update 2016-02 [Member] | Maximum [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Recognition requirements lease term 12 months