DEBT - Term Note (Details)	1 Months Ended			2 Months Ended	12 Months Ended
	Feb. 20, 2020 USD ($) draw	Aug. 31, 2019 USD ($)	Nov. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Repayment of short-term debt					$ 650,000,000	$ 350,000,000	$ 0
Term note
Short-term Debt [Line Items]
Repayment of short-term debt		$ 650,000,000
2018 Term Note | Term note
Short-term Debt [Line Items]
Face amount			$ 1,000,000,000.0
Debt instrument term (in years)			1 year
Repayment of short-term debt		$ 650,000,000		$ 350,000,000
2018 Term Note | Term note | LIBOR
Short-term Debt [Line Items]
Basis points spread on variable rate (percent)					1.15%
Base rate component, basis spread on variable rate (percent)					1.00%
2018 Term Note | Term note | Federal Funds Rate
Short-term Debt [Line Items]
Base rate component, basis spread on variable rate (percent)					0.50%
2020 Term Loan Commitment | Subsequent Event | Term note
Short-term Debt [Line Items]
Face amount	$ 1,000,000,000
Debt instrument term (in years)	1 year
Extension period term (in years)	1 year
Number of draws on term loan commitment allowable per agreement | draw	3
Minimum draw amount on term loan commitment allowable per agreement	$ 300,000,000
Unused commitment threshold for expiration	$ 300,000,000
2020 Term Loan Commitment | Subsequent Event | Term note | LIBOR
Short-term Debt [Line Items]
Basis points spread on variable rate (percent)	1.15%
Base rate component, basis spread on variable rate (percent)	1.00%
2020 Term Loan Commitment | Subsequent Event | Term note | Federal Funds Rate
Short-term Debt [Line Items]
Base rate component, basis spread on variable rate (percent)	0.50%