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						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net loss attributable to Rivian	$ (1,367)	$ (1,195)	$ (1,349)	$ (1,724)	$ (1,712)	$ (1,593)	$ (3,911)	$ (5,029)
Net loss attributable to common stockholders, basic	(1,367)			(1,724)			(3,911)	(5,029)
Net loss attributable to common stockholders, diluted	$ (1,367)			$ (1,724)			$ (3,911)	$ (5,029)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	952			918			942	909
Effect of dilutive securities (in shares)	0			0			0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	952			918			942	909
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.44)			$ (1.88)			$ (4.15)	$ (5.53)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.44)			$ (1.88)			$ (4.15)	$ (5.53)