Fair Value Measurement of Assets and Liabilities - Investments Measured Valued Using Unobservable Inputs (Details) - Recurring - Investments - GMarket $ in Millions	Mar. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket	$ 543
GPC method \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	1.2
GPC method \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	2.5
GMAC method \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	1.4
GMAC method \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	4.1

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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+ References

No definition available.

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