STOCKHOLDERS' EQUITY AND NET LOSS PER SHARE - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator
Net loss attributable to Rivian	$ (1,712)	$ (1,593)	$ (580)	$ (414)	$ (3,305)	$ (994)
Net loss attributable to common stockholders, basic	(1,712)		(580)		(3,305)	(994)
Net loss attributable to common stockholders, diluted	$ (1,712)		$ (580)		$ (3,305)	$ (994)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	908		101		904	101
Effect of dilutive securities (in shares)	0		0		0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	908		101		904	101
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.89)		$ (5.74)		$ (3.66)	$ (9.84)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.89)		$ (5.74)		$ (3.66)	$ (9.84)