The Company and Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts and authorized credits	$ 106		$ 102
Deferred revenue	86		77
Net revenues	2,580	$ 2,303
Cost of net revenues	559	514
Sales and marketing	756	648
Net income	$ 407	$ 1,035
Net income per share - basic (in usd per share)	$ 0.40	$ 0.96
Net income per share - diluted (in usd per share)	$ 0.40	$ 0.94
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	$ 86
As Reported | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net revenues		$ 2,217
Cost of net revenues		515
Sales and marketing		562
Net income		$ 1,035
Net income per share - basic (in usd per share)		$ 0.96
Net income per share - diluted (in usd per share)		$ 0.94