NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share Repurchase Program (Details) - USD ($)		3 Months Ended	6 Months Ended
	Aug. 04, 2020	Jun. 30, 2020	Jun. 30, 2020	Aug. 09, 2018	Sep. 06, 2016
Class of Stock [Line Items]
Stock repurchase program, additional authorized repurchase amount				$ 1,000,000,000
Stock repurchase program, authorized amount					$ 150,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 462,000,000	$ 462,000,000
Class A Common Stock
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)		5,000,000	15,000,000
Treasury stock, value acquired		$ 85,000,000	$ 261,000,000
Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, additional authorized repurchase amount	$ 500,000,000
Subsequent Event | Class A Common Stock
Class of Stock [Line Items]
Treasury stock, shares acquired (in shares)	4,000,000
Treasury stock, value acquired	$ 72,000,000