The Company and Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts and authorized credits	$ 100		$ 100		$ 102
Deferred revenue	90		90
Net revenues	2,640	$ 2,419	5,220	$ 4,722
Cost of net revenues	597	560	1,156	1,074
Sales and marketing	838	727	1,594	1,375
Net income	$ 642	$ 29	$ 1,049	$ 1,064
Net income per share - basic (in usd per share)	$ 0.64	$ 0.03	$ 1.04	$ 0.99
Net income per share - diluted (in usd per share)	$ 0.64	$ 0.03	$ 1.03	$ 0.97
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue					$ 20
Sales and marketing		$ 90		$ 176
As Reported | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net revenues		2,328		4,545
Cost of net revenues		561		1,076
Sales and marketing		637		1,199
Net income		$ 27		$ 1,062
Net income per share - basic (in usd per share)		$ 0.03		$ 0.98
Net income per share - diluted (in usd per share)		$ 0.02		$ 0.97
Warrant
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maximum percentage of shares acquirable	5.00%		5.00%