CASH AND CASH EQUIVALENTS, FUNDS RECEIVABLE AND CUSTOMER ACCOUNTS, AND INVESTMENTS - Schedule of Estimated Fair Value of Investments Classified as Available for Sale (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	$ 22,409	$ 21,278
Gross Unrealized Gains	21	29
Gross Unrealized Losses	(16)	(15)
Estimated Fair Value	22,414	21,292
Funds receivable and customer accounts \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	5,238	5,709
Gross Unrealized Gains	5	4
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	5,242	5,711
Funds receivable and customer accounts \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	107	77
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	107	77
Funds receivable and customer accounts \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,093	405
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,094	405
Funds receivable and customer accounts \| Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	4,490	4,039
Gross Unrealized Gains	9	13
Gross Unrealized Losses	(8)	(5)
Estimated Fair Value	4,491	4,047
Funds receivable and customer accounts \| Municipal securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	426	503
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Estimated Fair Value	427	504
Funds receivable and customer accounts \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	3,469	3,391
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Estimated Fair Value	3,470	3,392
Short-term investments \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	52	188
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Estimated Fair Value	52	186
Short-term investments \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	78	84
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	78	84
Short-term investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,887	1,751
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	1,887	1,749
Short-term investments \| Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	970	848
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(1)	0
Estimated Fair Value	970	853
Short-term investments \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	563	1,281
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Estimated Fair Value	563	1,282
Long-term investments: \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	271	235
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	271	235
Long-term investments: \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	124	124
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Estimated Fair Value	124	123
Long-term investments: \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,416	1,601
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,416	1,602
Long-term investments: \| Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,254	1,042
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(3)	(1)
Estimated Fair Value	1,251	$ 1,042
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	599
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	599
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	372
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 372

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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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