Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net income attributable to Coupang stockholders	$ 70	$ 91	$ (2)	$ 327
Denominator:
Weighted-average shares used in computing net (loss) income per share attributable to Class A and Class B common stockholders, basic (in shares)	1,795	1,784	1,792	1,780
Dilutive effect of equity compensation awards (in shares)	34	24	0	21
Weighted-average shares used in computing net (loss) income per share attributable to Class A and Class B common stockholders, diluted (in shares)	1,829	1,808	1,792	1,801
Net income (loss) attributable to Class A and Class B common stockholders per share, basic (in USD per share)	$ 0.04	$ 0.05	$ 0	$ 0.18
Net income (loss) attributable to Class A and Class B common stockholders per share, diluted (in USD per share)	$ 0.04	$ 0.05	$ 0	$ 0.18
Share-based Payment Arrangement
Denominator:
Anti-dilutive shares (in shares)	0	2	30	4