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Accounts Payable and Other Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Accounts Payable and Other Current Liabilities [Abstract]    
Accounts payable $ 386 $ 359
Accrued sales and use taxes 266 218
Accrued marketing and commissions, current 198 190
Employee-related Liabilities, Current 149 176
Deferred Revenue, Current 194 135
Public liability and property damage insurance liabilities, current 146 145
Accrued Insurance, Current 109 103
Other 329 293
Accounts payable and other current liabilities $ 1,777 $ 1,619