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Basis of Presentation and Accounting Policies (Details) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2017
New Accounting Pronouncements        
Operating lease liability $ 395,000,000      
Retained earnings [Member]        
New Accounting Pronouncements        
Cumulative effect adjustment       $ 22,000,000
Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncements        
Right-of-use asset   $ 320,000,000    
Operating lease liability   $ 384,000,000    
Accounting Standards Update 2016-02 [Member] | Retained earnings [Member]        
New Accounting Pronouncements        
Cumulative effect adjustment     $ 0