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, 2026	Dec. 31, 2025
Gross Amortized Cost
Total available-for-sale debt securities	$ 20,257	$ 18,904
Gross Unrealized Gains	17	18
Gross Unrealized Losses	(9)	(5)
Estimated Fair Value
Noncurrent	2,313	2,421
Fair Value	20,265	18,917
U.S. government and agency securities
Gross Amortized Cost
Noncurrent	480	400
Estimated Fair Value
Noncurrent	480	400
Foreign government and agency securities
Gross Amortized Cost
Noncurrent		50
Estimated Fair Value
Noncurrent		50
Corporate debt securities
Gross Amortized Cost
Noncurrent	542	648
Estimated Fair Value
Noncurrent	543	650
Mortgage-backed and asset-backed securities
Gross Amortized Cost
Noncurrent	1,288	1,320
Estimated Fair Value
Noncurrent	1,290	1,321
U.S. government and agency securities
Gross Amortized Cost
Current	250
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value
Available-for-sale debt securities	250
Funds receivable and customer accounts
Estimated Fair Value
Available-for-sale debt securities	15,827	14,457
Funds receivable and customer accounts \| U.S. government and agency securities
Gross Amortized Cost
Current	4,173	3,529
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	4,174	3,530
Funds receivable and customer accounts \| Foreign government and agency securities
Gross Amortized Cost
Current	85	81
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	85	81
Funds receivable and customer accounts \| Corporate debt securities
Gross Amortized Cost
Current	2,411	2,438
Gross Unrealized Gains	2	4
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value
Available-for-sale debt securities	2,412	2,441
Funds receivable and customer accounts \| Mortgage-backed and asset-backed securities
Gross Amortized Cost
Current	4,232	3,825
Gross Unrealized Gains	9	7
Gross Unrealized Losses	(4)	(1)
Estimated Fair Value
Available-for-sale debt securities	4,237	3,831
Funds receivable and customer accounts \| Municipal securities
Gross Amortized Cost
Current	33	98
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	33	98
Funds receivable and customer accounts \| Commercial paper
Gross Amortized Cost
Current	4,475	4,229
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(1)	0
Estimated Fair Value
Available-for-sale debt securities	4,475	4,230
Short-term investments
Estimated Fair Value
Available-for-sale debt securities	2,286	2,285
Short-term investments \| U.S. government and agency securities
Gross Amortized Cost
Current	395	443
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	395	443
Short-term investments \| Foreign government and agency securities
Gross Amortized Cost
Current	110	60
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	110	60
Short-term investments \| Corporate debt securities
Gross Amortized Cost
Current	809	985
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value
Available-for-sale debt securities	808	984
Short-term investments \| Mortgage-backed and asset-backed securities
Gross Amortized Cost
Current	404	448
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Estimated Fair Value
Available-for-sale debt securities	403	448
Short-term investments \| Commercial paper
Gross Amortized Cost
Current	570	350
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value
Available-for-sale debt securities	570	350
Long-term investments: \| U.S. government and agency securities
Gross Amortized Cost
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Long-term investments: \| Foreign government and agency securities
Gross Amortized Cost
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Long-term investments: \| Corporate debt securities
Gross Amortized Cost
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	0
Long-term investments: \| Mortgage-backed and asset-backed securities
Gross Amortized Cost
Gross Unrealized Gains	3	2
Gross Unrealized Losses	$ (1)	$ (1)

Debt Securities, Available-For-Sale, Excluding Accrued Interest

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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).

+ References

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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