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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 01, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 109 $ 23
Pacific Union      
Business Acquisition [Line Items]      
Cash consideration $ 116    
Goodwill $ 29    
Acquisition costs   2  
Revenue since acquisition   39  
Income from acquisition   14  
Intangible assets acquired   11  
Salaries, Wages and Benefits | Pacific Union      
Business Acquisition [Line Items]      
Acquisition costs   1  
General and Administrative Expense | Pacific Union      
Business Acquisition [Line Items]      
Acquisition costs   $ 1