Fair Value Measurement of Assets and Liabilities - Investments Measured Valued Using Unobservable Inputs (Details) - Recurring - Investments - Gmarket $ in Millions	Mar. 31, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket	$ 329
GPC method | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	0.6
GPC method | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	1.8
GMAC method | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	1.0
GMAC method | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity investment in Gmarket, measurement input	3.2