Defined Severance Benefits - Schedule of Expected Maturity Analysis of Undiscounted Defined Severance Benefits (Details) $ in Millions	Dec. 31, 2025 USD ($)
Retirement Benefits [Abstract]
Less than 1 year	$ 149
Between 1-2 years	142
Between 2-5 years	358
Over 5 years	514
Defined severance benefits	$ 1,163

Defined Benefit Plan, Expected Future Benefit Payment

No definition available.

Name:	cpng_DefinedBenefitPlanExpectedFutureBenefitPayment
Namespace Prefix:	cpng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Defined Benefit Plan, Expected Future Benefit Payment, Between Two And Five Years

+ References

No definition available.

+ Details

Name:	cpng_DefinedBenefitPlanExpectedFutureBenefitPaymentBetweenTwoAndFiveYears
Namespace Prefix:	cpng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Defined Benefit Plan, Expected Future Benefit Payment, Due After Five Years

+ References

No definition available.

+ Details

Name:	cpng_DefinedBenefitPlanExpectedFutureBenefitPaymentDueAfterFiveYears
Namespace Prefix:	cpng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant