STOCKHOLDERS' EQUITY AND NET LOSS PER SHARE - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator
Net loss attributable to Rivian	$ (1,724)	$ (1,712)	$ (1,593)	$ (1,233)	$ (580)	$ (414)	$ (5,029)	$ (2,227)
Net loss attributable to common stockholders, basic	(1,724)			(1,233)			(5,029)	(2,227)
Net loss attributable to common stockholders, diluted	$ (1,724)			$ (1,233)			$ (5,029)	$ (2,227)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	918,000,000			101,000,000			909,000,000	101,000,000
Effect of dilutive securities (in shares)	0			0			0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	918,000,000			101,000,000			909,000,000	101,000,000
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.88)			$ (12.21)			$ (5.53)	$ (22.05)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.88)			$ (12.21)			$ (5.53)	$ (22.05)