GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Roll-Forward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 23,759,740
Goodwill acquired	23,000
Effect of foreign currency translation	2,284
Measurement-period adjustments	(39,684)
Balance at end of period	23,745,340
Merchant Solutions
Goodwill [Roll Forward]
Balance at beginning of period	13,415,352
Goodwill acquired	23,000
Effect of foreign currency translation	4,264
Measurement-period adjustments	(3,875)
Balance at end of period	13,438,741
Issuer Solutions
Goodwill [Roll Forward]
Balance at beginning of period	7,985,731
Goodwill acquired	0
Effect of foreign currency translation	(1,980)
Measurement-period adjustments	(42,298)
Balance at end of period	7,941,453
Business and Consumer Solutions
Goodwill [Roll Forward]
Balance at beginning of period	2,358,657
Goodwill acquired	0
Effect of foreign currency translation	0
Measurement-period adjustments	6,489
Balance at end of period	$ 2,365,146