FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Schedule of Investments under the Fair Value Option (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 22,409		$ 21,278
Fair Value	22,414		21,292
Fair Value Option, Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Funds receivable and customer accounts	31	$ (7)
Funds receivable and customer accounts \| Fair Value Option, Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	687		566
Fair Value	$ 683		$ 564

Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-30

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