Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized software development costs, net of accumulated amortization	$ 893	$ 829
Amortization of capitalized software development costs	556	479	$ 398
Property and equipment, net	2,198	1,877
Capital expenditures	1,160	878	710
Build To Suit Asset
Property, Plant and Equipment [Line Items]
Property and equipment, net		152
New Corporate Headquarters
Property, Plant and Equipment [Line Items]
Capital expenditures				$ 229
Accounts Payable
Property, Plant and Equipment [Line Items]
Acquisition of property and equipment, non-cash investing activity	$ 34	$ 55	$ 22