The Company and Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Capitalized software development costs	$ 137,000,000	$ 136,000,000
Amortization of previously capitalized software	149,000,000	110,000,000	$ 115,000,000
Advertising expense	1,200,000,000	1,000,000,000	1,000,000,000
Allowance for doubtful accounts receivable and authorized credits	81,000,000	84,000,000
Impairment of long-lived assets	$ 0	$ 0	$ 0
Furniture and Fixtures and Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Minimum
Property, Plant and Equipment [Line Items]
Historical duration of advertising contracts	7 days
General duration of advertising contracts	7 days
Estimated useful lives, intangible assets	1 year
Minimum | Internal Use Software And Website Development
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	1 year
Minimum | Computer Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	1 year
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Maximum
Property, Plant and Equipment [Line Items]
Historical duration of advertising contracts	5 years
General duration of advertising contracts	1 year
Estimated useful lives, intangible assets	5 years
Maximum | Internal Use Software And Website Development
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Maximum | Computer Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Maximum | Building and Building Improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	30 years
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Common stock | PayPal
Class of Stock [Line Items]
Spinoff, Distribution of outstanding common stock to existing stockholders, percentage		100.00%
Accounting Standards Update 2015-03 | Other assets
New Accounting Pronouncement, Early Adoption [Line Items]
Debt issuance costs		$ (30,000,000)
Accounting Standards Update 2015-03 | Long-term debt
New Accounting Pronouncement, Early Adoption [Line Items]
Debt issuance costs		$ 30,000,000