Property and Equipment - Summary of Major Classes of Property and Equipment (Detail) - USD ($) $ in Millions |
Dec. 31, 2017 |
Dec. 31, 2016 |
---|---|---|
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | $ 923 | $ 769 |
Less accumulated depreciation | (483) | (363) |
Property and equipment, net | 440 | 406 |
Land, buildings and leasehold improvements [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 324 | 333 |
Equipment [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 446 | 338 |
Furniture and fixtures [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 81 | 72 |
Transportation equipment [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | $ 72 | $ 26 |