CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Stockholders’ equity:
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Convertible preferred stock, shares issued (in shares)	0	0
Convertible preferred stock, shares outstanding (in shares)	0	0
Common stock and capital stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock and capital stock, shares authorized (in shares)	15,000,000,000	15,000,000,000
Common stock and capital stock, shares issued (in shares)	667,637,000	675,222,000
Common stock and capital stock, shares outstanding (in shares)	667,637,000	675,222,000
Class A Common Stock
Stockholders’ equity:
Common stock and capital stock, shares authorized (in shares)	9,000,000,000	9,000,000,000
Common stock and capital stock, shares issued (in shares)	301,040,000	300,730,000
Common stock and capital stock, shares outstanding (in shares)	301,040,000	300,730,000
Class B Common Stock
Stockholders’ equity:
Common stock and capital stock, shares authorized (in shares)	3,000,000,000	3,000,000,000
Common stock and capital stock, shares issued (in shares)	45,546,000	45,843,000
Common stock and capital stock, shares outstanding (in shares)	45,546,000	45,843,000
Class C Capital Stock
Stockholders’ equity:
Common stock and capital stock, shares authorized (in shares)	3,000,000,000	3,000,000,000
Common stock and capital stock, shares issued (in shares)	321,051,000	328,649,000
Common stock and capital stock, shares outstanding (in shares)	321,051,000	328,649,000