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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Land   $ 12 $ 66
Buildings and leasehold improvements   384 379
Furniture and equipment   357 337
Construction-in-progress   14 13
Property and equipment, gross   767 795
Accumulated depreciation   (426) (384)
Property and equipment, net $ 341 $ 341 $ 411