ACQUISITIONS - Acquisition Date Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net
Goodwill	$ 23,662,373	$ 23,759,740
TSYS
Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net
Cash and cash equivalents	446,009	446,009
Accounts receivable	439,938	442,848
Identified intangible assets	10,980,000	10,980,000
Property and equipment	644,084	644,084
Other assets	1,469,885	1,474,825
Accounts payable and accrued liabilities	(613,824)	(614,060)
Debt	(3,290,555)	(3,295,342)
Deferred income tax liabilities	(2,630,280)	(2,687,849)
Other liabilities	(314,415)	(314,415)
Total identifiable net assets	7,130,842	7,076,100
Goodwill	17,344,111	17,398,853
Total purchase consideration	24,474,953	$ 24,474,953
Measurement-Period Adjustments
Cash and cash equivalents	0
Accounts receivable	(2,910)
Identified intangible assets	0
Property and equipment	0
Other assets	(4,940)
Accounts payable and accrued liabilities	236
Debt	4,787
Deferred income tax liabilities	57,569
Other liabilities	0
Total identifiable net assets	54,742
Goodwill	(54,742)
Total purchase consideration	$ 0