ACQUISITIONS - Acquisition Date Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net
Goodwill	$ 23,745,340	$ 23,759,740
TSYS
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net
Cash and cash equivalents	446,009	446,009
Accounts receivable	440,188	442,848
Identified intangible assets	10,980,978	10,980,000
Property and equipment	643,106	644,084
Other assets	1,471,856	1,474,825
Accounts payable and accrued liabilities	(625,959)	(614,060)
Debt	(3,290,555)	(3,295,342)
Deferred income tax liabilities	(2,635,251)	(2,687,849)
Other liabilities	(314,588)	(314,415)
Total identifiable net assets	7,115,784	7,076,100
Goodwill	17,359,169	17,398,853
Total purchase consideration	24,474,953	$ 24,474,953
Measurement-Period Adjustments
Cash and cash equivalents	0
Accounts receivable	(2,660)
Identified intangible assets	978
Property and equipment	(978)
Other assets	(2,969)
Accounts payable and accrued liabilities	(11,899)
Debt	4,787
Deferred income tax liabilities	52,598
Other liabilities	(173)
Total identifiable net assets	39,684
Goodwill	(39,684)
Total purchase consideration	$ 0