Convertible Senior Notes - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions		3 Months Ended	12 Months Ended
	Apr. 30, 2014	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Proceeds from convertible debt offering			$ 0	$ 0	$ 1,415,717,000
Stock repurchase program, authorized amount		$ 1,500,000,000.0	6,800,000,000
Payments for repurchase of common stock			28,689,000	755,704,000	$ 1,640,885,000
Shares repurchased under the ASR		1,500,000,000
Temporary equity			79,495,000	0
Senior Notes Due 2019
Debt Instrument [Line Items]
Convertible debt	$ 1,440,000,000		$ 1,348,156,000	1,324,992,000
Stated interest rate (percent)	0.50%
Proceeds from convertible debt offering	$ 1,420,000,000
Net proceeds used to pay the cost of Bind Hedges	$ 82,600,000
Convertible debt, conversion ratio	0.011111
Principal amount of convertible notes	$ 1,000
Convertible debt, conversion price (in dollars per share)			$ 90.00
Repurchase price as a percent of principal amount (percent)	100.00%
Effective interest rate (percent)			3.00%
Deferred tax liability			$ 8,200,000
Temporary equity			$ 79,495,000	$ 0
Shares of common stock covered by note hedges (shares)	16.0
Additional warrant transaction (shares)	16.0
Initial strike price of warrants (per share)	$ 120.0
Privately Negotiated Transaction
Debt Instrument [Line Items]
Payments for repurchase of common stock		101,000,000
Purchase From Accelerated Share Repurchase
Debt Instrument [Line Items]
Shares repurchased under the ASR		$ 1,400,000,000