STOCKHOLDERS' EQUITY AND NET LOSS PER SHARE - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator
Net loss attributable to Rivian	$ (1,100)	$ (1,457)	$ (1,446)	$ (1,367)	$ (1,195)	$ (1,349)	$ (4,003)	$ (3,911)
Net loss attributable to common stockholders, basic	(1,100)			(1,367)			(4,003)	(3,911)
Net loss attributable to common stockholders, diluted	$ (1,100)			$ (1,367)			$ (4,003)	$ (3,911)
Denominator
Weighted-average Class A and Class B common shares outstanding - basic (in shares)	1,014			952			998	942
Effect of dilutive securities (in shares)	0			0			0	0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares)	1,014			952			998	942
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share)	$ (1.08)			$ (1.44)			$ (4.01)	$ (4.15)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share)	$ (1.08)			$ (1.44)			$ (4.01)	$ (4.15)