CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, authorized (in shares)	0	414,033,220
Redeemable convertible preferred stock, issued (in shares)	0	412,742,897
Redeemable convertible preferred stock, outstanding (in shares)	0	412,742,897
Redeemable convertible preferred stock, Liquidation preference		$ 2,191,086,000
Preferred stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)		0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	0	777,354,000
Common stock, shares issued (in shares)	0	229,031,546
Common stock, shares outstanding (in shares)	0	229,031,546
Common Class A
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	21,000,000,000	0
Common stock, shares issued (in shares)	725,229,836	0
Common stock, shares outstanding (in shares)	725,229,836	0
Common Class B
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	700,000,000	0
Common stock, shares issued (in shares)	130,155,246	0
Common stock, shares outstanding (in shares)	130,155,246	0
Common Class C
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	7,000,000,000	0
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0