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BUSINESS COMBINATIONS - Acquisitions Completed in 2021 (Details) $ in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	Oct. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) business
Business Acquisition [Line Items]
Cash consideration paid		$ 0	$ 469
Goodwill		$ 11,053		$ 11,454
Paidy, Inc.
Business Acquisition [Line Items]
Aggregate purchase price for acquisitions	$ 2,700
Cash consideration paid	2,600
Equity interest issued	161
Gross contractual receivables	$ 216
Award vesting period	4 years
Intangible assets acquired	$ 642
Goodwill	$ 1,897
Paidy, Inc. \| Minimum
Business Acquisition [Line Items]
Intangible assets acquired, useful life	3 years
Paidy, Inc. \| Maximum
Business Acquisition [Line Items]
Intangible assets acquired, useful life	7 years
Other acquisitions completed
Business Acquisition [Line Items]
Aggregate purchase price for acquisitions				$ 542
Number of businesses acquired \| business				4
Intangible assets acquired				$ 90
Net assets				17
Goodwill				$ 435
Other acquisitions completed \| Minimum
Business Acquisition [Line Items]
Intangible assets acquired, useful life				1 year
Other acquisitions completed \| Maximum
Business Acquisition [Line Items]
Intangible assets acquired, useful life				7 years