CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
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)	677,724,000	688,335,000
Common stock and capital stock, shares outstanding (in shares)	677,724,000	688,335,000
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)	300,641,000	299,828,000
Common stock and capital stock, shares outstanding (in shares)	300,641,000	299,828,000
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)	45,915,000	46,441,000
Common stock and capital stock, shares outstanding (in shares)	45,915,000	46,441,000
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)	331,168,000	342,066,000
Common stock and capital stock, shares outstanding (in shares)	331,168,000	342,066,000