Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income attributable to Coupang stockholders	$ 5	$ 91
Denominator:
Weighted-average shares used in computing net income per share attributable to Class A and Class B common stockholders, basic (in shares)	1,794	1,775
Dilutive effect of equity compensation awards (in shares)	21	20
Weighted-average shares used in computing net loss per share attributable to Class A and Class B common stockholders, diluted (in shares)	1,815	1,794
Net income (loss) attributable to Class A and Class B common stockholders per share, basic (in USD per share)	$ 0	$ 0.05
Net income (loss) attributable to Class A and Class B common stockholders per share, diluted (in USD per share)	$ 0	$ 0.05
Share-based Payment Arrangement
Denominator:
Anti-dilutive shares (in shares)	2	6