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INCOME TAX - Reconciliation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal U.S. statutory rate	21.00%	21.00%	21.00%
Tax credits	(5.30%)	(3.90%)	(0.50%)
Foreign interest income not subject to tax	(4.20%)	(4.50%)	(1.70%)
Foreign-derived intangible income deduction	(2.80%)	(2.70%)	(1.60%)
Share-based compensation expense	(2.70%)	(2.50%)	(2.10%)
Nondeductible executive compensation	1.70%	1.00%	0.30%
Equity method investment partnership income	1.10%	0.00%	0.00%
Uncertain tax positions	1.10%	(2.60%)	(0.90%)
State income taxes, net of federal income tax benefit	0.70%	1.00%	2.70%
Foreign income taxes	0.60%	(0.70%)	(0.50%)
Valuation allowance	(0.10%)	4.60%	1.40%
Federal U.S. transition tax	0.00%	0.00%	(4.10%)
Other	1.90%	1.30%	(0.20%)
Effective tax rate	13.00%	12.00%	13.80%

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