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, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator
Net loss attributable to Rivian	$ (1,457)	$ (1,446)	$ (1,195)	$ (1,349)	$ (2,903)	$ (2,544)
Net loss attributable to common stockholders, basic	(1,457)		(1,195)		(2,903)	(2,544)
Net loss attributable to common stockholders, diluted	$ (1,457)		$ (1,195)		$ (2,903)	$ (2,544)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	1,001		942		990	937
Effect of dilutive securities (in shares)	0		0		0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	1,001		942		990	937
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.46)		$ (1.27)		$ (2.93)	$ (2.72)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.46)		$ (1.27)		$ (2.93)	$ (2.72)