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
	Mar. 31, 2022	Mar. 31, 2021
Numerator
Net loss attributable to Rivian	$ (1,593)	$ (414)
Net loss attributable to common stockholders, basic	(1,593)	(414)
Net loss attributable to common stockholders, diluted	$ (1,593)	$ (414)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	901	101
Effect of dilutive securities (in shares)	0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	901	101
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.77)	$ (4.10)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.77)	$ (4.10)