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Property and Equipment Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Land   $ 12 $ 12
Buildings And Leasehold Improvements   456 428
Furniture And Equipment   356 346
Construction in Progress, Gross   24 17
Property, Plant and Equipment, Gross   848 803
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   481 450
Property, Plant and Equipment, Net $ 418 $ 367 $ 353