Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Net income (loss) attributable to Coupang stockholders	$ 32	$ (77)	$ 139	$ (72)
Denominator:
Weighted-average shares used in computing net income (loss) per share attributable to Class A and Class B common stockholders, basic (in shares)	1,817	1,789	1,812	1,791
Dilutive effect of equity compensation awards (in shares)	38	0	35	0
Weighted-average shares used in computing net income (loss) per share attributable to Class A and Class B common stockholders, diluted (in shares)	1,855	1,789	1,847	1,791
Earnings per share
Earnings per share, basic (in USD per share)	$ 0.02	$ (0.04)	$ 0.08	$ (0.04)
Earnings per share, diluted (in USD per share)	$ 0.02	$ (0.04)	$ 0.08	$ (0.04)
Anti-dilutive shares	0	34	0	28