Summary of Significant Accounting Policies - Impact of Adoption of ASU2016-02 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 10, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 144,330	$ 495,000
Total assets	33,230,935		$ 30,587,012
Other accrued expenses	817,978		802,388
Operating lease liabilities	84,795
Long-term deferred revenue and other long-term liabilities	695,018		470,932
Total liabilities	21,114,788		21,532,755
Total stockholders' equity (deficit)	11,564,072		8,594,189	$ 6,937,906	$ 4,611,323
Total liabilities and stockholders' equity (deficit)	33,230,935		$ 30,587,012
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	144,330
Total assets	33,230,935
Other accrued expenses	817,978
Operating lease liabilities	84,795
Long-term deferred revenue and other long-term liabilities	695,018
Total liabilities	21,114,788
Total stockholders' equity (deficit)	11,564,072
Total liabilities and stockholders' equity (deficit)	33,230,935
Accounting Standards Update 2016-02 | As would have been reported under previous standards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total assets	33,086,605
Other accrued expenses	760,068
Long-term deferred revenue and other long-term liabilities	693,393
Total liabilities	20,970,458
Total stockholders' equity (deficit)	11,564,072
Total liabilities and stockholders' equity (deficit)	33,086,605
Accounting Standards Update 2016-02 | Impact of adopting ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	144,330
Total assets	144,330
Other accrued expenses	57,910
Operating lease liabilities	84,795
Long-term deferred revenue and other long-term liabilities	1,625
Total liabilities	144,330
Total liabilities and stockholders' equity (deficit)	$ 144,330