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Property, Equipment, and Capitalized Software, Net - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Summary of property and equipment |  |
Property and equipment, gross | $ 883 | $ 919
Less: accumulated amortization - capitalized software | (308) | (259)
Less: accumulated depreciation and amortization - building and improvements, furniture and equipment | (233) | (206)
Accumulated depreciation, Total | (541) | (465)
Property, equipment, and capitalized software, net | 342 | 454
Capitalized software |  |
Summary of property and equipment |  |
Property and equipment, gross | 417 | 443
Furniture and equipment |  |
Summary of property and equipment |  |
Property and equipment, gross | 289 | 301
Building and improvements |  |
Summary of property and equipment |  |
Property and equipment, gross | 161 | 159
Land |  |
Summary of property and equipment |  |
Property and equipment, gross | $ 16 | $ 16

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