Schedule I - Condensed Financial information of Parent (Coupang, Inc.) - Condensed Statements of Operations and Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Income Statements, Captions [Line Items]
Management service fee revenues	$ 34,534	$ 30,268	$ 24,383
Operating cost and expenses	(34,061)	(29,832)	(23,910)
Interest expense	(86)	(140)	(48)
Other income, net	11	(39)	(19)
Income before income taxes	597	473	584
Income tax expense (benefit)	383	407	(776)
Net income	214	66	1,360
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	14	(353)	(2)
Actuarial gain (loss) on defined severance benefits, net of tax	(11)	34	18
Total other comprehensive income (loss)	22	(386)	(20)
Comprehensive income (loss)	236	(320)	1,340
Parent company
Condensed Income Statements, Captions [Line Items]
Management service fee revenues	6	20	18
Operating cost and expenses	(579)	(558)	(400)
Interest expense	(12)	(2)	(2)
Other income, net	64	63	84
Loss before equity in earnings of subsidiaries	(521)	(477)	(300)
Equity in earnings of subsidiaries	661	722	1,783
Income before income taxes	140	245	1,483
Income tax expense (benefit)	(68)	91	123
Net income	208	154	1,360
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	14	(353)	(2)
Actuarial gain (loss) on defined severance benefits, net of tax	11	(34)	(18)
Total other comprehensive income (loss)	25	(387)	(20)
Comprehensive income (loss)	$ 233	$ (233)	$ 1,340