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Summary of Significant Accounting Policies (Details) - Updated Guidance - USD ($)
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2017
New Accounting Pronouncements            
Operating lease liability     $ 380,000,000      
Accumulated Other Comprehensive Income (Loss) [Member]            
New Accounting Pronouncements            
Cumulative effect adjustment $ (22,000,000)         $ (22,000,000)
Reclassification of certain tax effects from adoption of updated accounting guidance (24,000,000) $ (24,000,000)        
Retained earnings [Member]            
New Accounting Pronouncements            
Cumulative effect adjustment           $ 22,000,000
Reclassification of certain tax effects from adoption of updated accounting guidance   $ 24,000,000        
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]            
New Accounting Pronouncements            
Cumulative effect adjustment (22,000,000)          
Accounting Standards Update 2016-01 [Member] | Retained earnings [Member]            
New Accounting Pronouncements            
Cumulative effect adjustment 22,000,000          
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]            
New Accounting Pronouncements            
Reclassification of certain tax effects from adoption of updated accounting guidance (24,000,000)          
Accounting Standards Update 2018-02 [Member] | Retained earnings [Member]            
New Accounting Pronouncements            
Reclassification of certain tax effects from adoption of updated accounting guidance $ 24,000,000          
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