FUNDS RECEIVABLE AND CUSTOMER ACCOUNTS AND INVESTMENTS - Schedule of Estimated Fair Value of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	$ 22,869	$ 23,232
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(592)	(87)
Estimated Fair Value	22,278	23,145
Funds receivable and customer accounts \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	8,736	8,754
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(252)	(31)
Estimated Fair Value	8,484	8,723
Funds receivable and customer accounts \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,479	1,849
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(44)	(9)
Estimated Fair Value	1,435	1,840
Funds receivable and customer accounts \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,637	3,377
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(82)	(15)
Estimated Fair Value	1,555	3,362
Funds receivable and customer accounts \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,324	1,552
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26)	(3)
Estimated Fair Value	1,298	1,549
Funds receivable and customer accounts \| Municipal securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	410	535
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	0
Estimated Fair Value	407	535
Funds receivable and customer accounts \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	3,702
Gross Unrealized Gains	1
Gross Unrealized Losses	(14)
Estimated Fair Value	3,689
Short-term investments \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	815	537
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	0
Estimated Fair Value	812	537
Short-term investments \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	435	493
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11)	(1)
Estimated Fair Value	424	492
Short-term investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	641	2,285
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	0
Estimated Fair Value	627	2,285
Short-term investments \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	415	278
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(9)	(1)
Estimated Fair Value	406	277
Short-term investments \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	324
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	324
Long-Term Investments \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	493	568
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(36)	(6)
Estimated Fair Value	457	562
Long-Term Investments \| Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	386	742
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(22)	(6)
Estimated Fair Value	364	736
Long-Term Investments \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	987	1,445
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(58)	(11)
Estimated Fair Value	929	1,434
Long-Term Investments \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,085	817
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(18)	(4)
Estimated Fair Value	$ 1,067	$ 813

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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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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