Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income attributable to Coupang stockholders	$ 107	$ 5
Denominator:
Weighted-average shares outstanding, basic (in shares)	1,806	1,794
Dilutive effect of equity compensation awards (in shares)	34	21
Weighted-average shares used in computing net (loss) income per share attributable to Class A and Class B common stockholders, diluted (in shares)	1,840	1,815
Earnings per share
Earnings per share, basic (in USD per share)	$ 0.06	$ 0
Earnings per share, diluted (in USD per share)	$ 0.06	$ 0
Anti-dilutive shares	0	2