Marketable Securities and Equity Investments - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Summary of cash, cash equivalents and marketable securities
Cash	$ 3,500,000,000		$ 3,500,000,000		$ 3,300,000,000
Net unrealized gains (losses)	16,700,000	$ 46,700,000	(143,100,000)	$ 5,000,000.0
Allowance for credit loss for available-for-sale debt securities	0	$ 0	0	$ 0
Other Assets
Summary of cash, cash equivalents and marketable securities
Equity securities without readily determinable fair value, amount	$ 98,600,000		$ 98,600,000