Earnings 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) income attributable to Coupang stockholders	$ (570)	$ 32	$ (836)	$ 139
Weighted-average shares used in computing net income per share attributable to Class A and Class B common stockholders:
Basic (in shares)	1,799	1,817	1,812	1,812
Dilutive effect of equity compensation awards (in shares)	0	38	0	35
Diluted (in shares)	1,799	1,855	1,812	1,847
Earnings per share
Basic (in usd per share)	$ (0.32)	$ 0.02	$ (0.46)	$ 0.08
Diluted (in usd per share)	$ (0.32)	$ 0.02	$ (0.46)	$ 0.08
Anti-dilutive shares (in shares)	22	0	24	0