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Reorganization and Business Transformation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Restructuring costs $ 11 $ 23
Accelerated depreciation 6  
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2018 12  
Expense accruals 5  
Cash payments (10) (11)
Balance at March 31, 2019 7 12
Employee separation benefits costs related to headquarter transition and business transformation    
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2018 11  
Expense accruals 4  
Cash payments (8)  
Balance at March 31, 2019 7 11
Transition support and other exit related costs for the headquarter transition and business transformation    
Restructuring Reserve [Roll Forward]    
Balance at December 31, 2018 1  
Expense accruals 1  
Cash payments (2)  
Balance at March 31, 2019 0 $ 1
Minimum    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related cost, expected cost 35  
Maximum    
Restructuring Cost and Reserve [Line Items]    
Restructuring and related cost, expected cost $ 40