Schedule I - Condensed Financial information of Parent (Coupang, Inc.) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating activities
Net cash (used in) provided by operating activities	$ 1,773	$ 1,886	$ 2,652
Investing activities
Other investing activities	(8)	(17)	(50)
Net cash used in investing activities	(1,254)	(819)	(927)
Financing activities
Repurchase of Class A common stock	(243)	(178)	0
Proceeds from issuance of common stock, equity-based compensation plan	5	4	9
Other financing activities	2,900	857	572
Net cash (used in) provided by financing activities	(247)	(69)	199
Cash and cash equivalents
Net increase in cash and cash equivalents and restricted cash	381	434	1,910
Cash and cash equivalents and restricted cash, as of beginning of period	6,031	5,597	3,687
Cash and cash equivalents and restricted cash, as of end of period	6,412	6,031	5,597
Parent company
Operating activities
Net cash (used in) provided by operating activities	(65)	(126)	95
Investing activities
Capital contribution to subsidiaries	(802)	(349)	(121)
Return of capital contribution from subsidiaries	1,168	90	61
Increase of short-term loans	(393)	(95)	(25)
Decrease of short-term loans	30	0	0
Purchases of held-to-maturity securities	(33)	0	0
Proceeds from maturity of held-to-maturity securities	33	0	0
Other investing activities	(4)	0	0
Net cash used in investing activities	(1)	(354)	(85)
Financing activities
Repurchase of Class A common stock	(243)	(178)	0
Proceeds from issuance of common stock, equity-based compensation plan	5	4	9
Proceeds from short-term borrowings	425	0	0
Repayment of short-term borrowings	(425)	0	0
Other financing activities	(3)	(1)	0
Net cash (used in) provided by financing activities	(241)	(175)	9
Cash and cash equivalents
Net increase in cash and cash equivalents and restricted cash	(307)	(655)	19
Cash and cash equivalents and restricted cash, as of beginning of period	1,016	1,671	1,652
Cash and cash equivalents and restricted cash, as of end of period	$ 709	$ 1,016	$ 1,671