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FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Fair Value of Financial Assets and Liabilities Measured at Amortized Cost (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Reported Value Measurement | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	$ 23,811	$ 14,069
Reported Value Measurement | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	26,100	18,627
Reported Value Measurement | Accounts payable and accrued expenses | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	4,053	3,196
Reported Value Measurement | Funds payable to customers | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	10,567	6,954
Reported Value Measurement | Amounts payable due to credit and debit card transactions | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	3,059	1,964
Reported Value Measurement | Salaries and social security payable | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	689	564
Reported Value Measurement | Loans payable and other financial liabilities | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	7,728	5,593
Reported Value Measurement | Other liabilities | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	4	356
Reported Value Measurement | Cash and cash equivalents | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	1,898	2,059
Reported Value Measurement | Restricted cash and cash equivalents | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	6,258	1,298
Reported Value Measurement | Investments | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	316	160
Reported Value Measurement | Accounts receivables, net | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	298	255
Reported Value Measurement | Credit cards | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	6,648	5,288
Reported Value Measurement | Loans receivable, net | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	8,192	4,895
Reported Value Measurement | Other assets | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	201	114
Estimate Of Fair Value Measurement | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	23,673	14,014
Estimate Of Fair Value Measurement | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	26,059	18,533
Estimate Of Fair Value Measurement | Accounts payable and accrued expenses | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	4,053	3,196
Estimate Of Fair Value Measurement | Funds payable to customers | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	10,567	6,954
Estimate Of Fair Value Measurement | Amounts payable due to credit and debit card transactions | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	3,059	1,964
Estimate Of Fair Value Measurement | Salaries and social security payable | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	689	564
Estimate Of Fair Value Measurement | Loans payable and other financial liabilities | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	7,687	5,499
Estimate Of Fair Value Measurement | Other liabilities | Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Liabilities	4	356
Estimate Of Fair Value Measurement | Cash and cash equivalents | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	1,898	2,059
Estimate Of Fair Value Measurement | Restricted cash and cash equivalents | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	6,258	1,298
Estimate Of Fair Value Measurement | Investments | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	316	160
Estimate Of Fair Value Measurement | Accounts receivables, net | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	298	255
Estimate Of Fair Value Measurement | Credit cards | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	6,648	5,288
Estimate Of Fair Value Measurement | Loans receivable, net | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	8,054	4,840
Estimate Of Fair Value Measurement | Other assets | Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets	$ 201	$ 114

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