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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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator        
Net loss attributable to Rivian $ (833) $ (1,117) $ (1,249) $ (1,662)
Net loss attributable to common stockholders, basic (833) (1,117) (1,249) (1,662)
Net loss attributable to common stockholders, diluted $ (833) $ (1,117) $ (1,249) $ (1,662)
Denominator        
Weighted-average Class A and Class B common shares outstanding - basic (in shares) 1,325 1,155 1,287 1,146
Effect of dilutive securities (in shares) 0 0 0 0
Weighted-average Class A and Class B common shares outstanding - diluted (in shares) 1,325 1,155 1,287 1,146
Net loss per share attributable to Class A and Class B common stockholders, basic (in dollars per share) $ (0.63) $ (0.97) $ (0.97) $ (1.45)
Net loss per share attributable to Class A and Class B common stockholders, diluted (in dollars per share) $ (0.63) $ (0.97) $ (0.97) $ (1.45)