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Property And Equipment, net (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 2,019   $ 2,012
Less: accumulated depreciation 497   455
Property and equipment, net 1,522 $ 1,557 1,557
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 523   516
Buildings and leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 716   714
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 660   623
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 120   $ 159